Articoli di riviste: "Drusen"

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Shchuko, A. G., D. Yu Samsonov, S. I. Zhukova, T. N. Iureva, I. M. Mikhalevich, A. V. Grigorieva e Yu S. Samsonova. "Differential Change in Retina Structure and Function in Children and Adolescents with Drusens of the Optic Nerve Disk". Ophthalmology in Russia 15, n. 2S (28 luglio 2018): 73–81. http://dx.doi.org/10.18008/1816-5095-2018-2s-73-81.

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The first histological and clinical description of the optic nerve drusens was given in the 19th century. Then authors considered drusens as congenital pathologies, and a study of 1999 showed that drusen is not the primary pathology, but the dysplasia of the optic nerve disk and its circulation predisposes to the formation of drusen. Central vision in patients with drusens of the optic nerve disc is reduced rarely, and their diagnosis is reduced to ascertaining of the fact of having drusen without taking into account the structural and functional changes in the visual system.Purpose of the work: to identify the pattern of changes in visual functions in children and adolescents with druses of the optic nerve disk, the development and addition of classification criteria.Patients and methods. 45 children with drusens were examined, a comprehensive analysis of the visual system included a standard ophthalmological examination, a comprehensive study of visual system with ultrasound scanning, OCT and OCTA, standard automated and pulsarperimetry.Based on the results of the cluster analysis, a graph of the distribution of patients into three groups (control group and two clinical groups) was constructed, and the structural and functional state of the visual system was analyzed. Drusens in children in the second group we marked as “peripheral”, and in the third — “central”. The carried out researches have shown, that the revealed disturbances are more expressed in the third clinical group. All this determines the need to complement the clinical classification of drusens and their separation depending on the location relative to the vessels of the optic nerve disk to the central and peripheral. The compression effect of drusen is accompanied with changes in the volume of the optic nerve disc, a violation of retinal hemodynamics, damage to the neuroglia and ganglion cells, which allows treating this pathology as a progressive neuroopticopathy, and the revealed dependence of changes on the localization of druses requires supplementing the existing classification.

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Schlanitz, Ferdinand, Bernhard Baumann, Stefan Sacu, Lukas Baumann, Michael Pircher, Christoph K. Hitzenberger e Ursula Margarethe Schmidt-Erfurth. "Impact of drusen and drusenoid retinal pigment epithelium elevation size and structure on the integrity of the retinal pigment epithelium layer". British Journal of Ophthalmology 103, n. 2 (29 aprile 2018): 227–32. http://dx.doi.org/10.1136/bjophthalmol-2017-311782.

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PurposeTo evaluate the impact of drusen size and structure on retinal pigment epithelium (RPE) and photoreceptor layers in eyes with early to intermediate age-related macular degeneration (AMD) using polarisation-sensitive optical coherence tomography (OCT).DesignRetrospective investigation of an observational cross-sectional study.ParticipantsPatients with early to intermediate AMD.MethodsTwenty-five eyes of 25 patients with drusen were imaged with polarisation-sensitive OCT using macular volume scans. Each scan was manually graded for six distinct drusen characteristics and the integrity of both the overlying RPE and photoreceptor layer. The central scan of each single druse, as well as its diameter and location, were selected for statistical calculations.ResultsA total number of 5933 individual drusen including their adjacent RPE and photoreceptor layer were evaluated. 41.3% of all drusen demonstrated an intact overlying RPE; in 28.1% the RPE layer was irregular, but continuous. In 30.6%, the RPE layer signal was discontinuous above the area of drusen. The level of RPE alteration was significantly related to shape (p<0.001), internal reflectivity (p<0.001) and homogeneity (p<0.001) of the drusen and their diameter, with a higher probability for larger drusen to have a discontinuous RPE (OR 3.2, p<0.001). The number of drusen showing overlying foci or an altered photoreceptor layer was too small to be conclusive, but showed a trend towards an altered RPE if present.ConclusionsPolarisation-sensitive OCT reveals a correlation between specific drusen characteristics and the integrity of the overlying RPE layer. Drusen diameter and configuration were significantly associated with RPE loss.

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Čmelo, Jozef, Jela Valášková e Vladimír Krásnik. "Optic Disc Drusen and Heamodynamics". Czech and Slovak Ophthalmology 75, n. 5 (26 ottobre 2019): 252–56. http://dx.doi.org/10.31348/2019/5/2.

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Purpose: The problem of optic disc drusen (ODD) has been described in detail in several publications. However, less attention has been devoted to real haemodynamic parameters (HP) in ODD. It has been clinically demonstrated that the occurrence and progression of changes in the visual field in ODD are closely linked with the haemodynamics of the vascular supply of the eye – the optic nerve. ODD may visually overlap excavation of the disc of the optic nerve, on the basis of which it is more difficult to evaluate changes (scotomas) in the visual field in the case of glaucoma. Methods: Haemodynamic parameters were prospectively evaluated in 54 patients with compensated intraocular pressure and with optic disc drusens. Drusens in the head of the optic nerve were demonstrated by a fundus examination and B-scan ultrasonography (USG). The drusens were divided into 3 groups according to the size of the individual drusens or drusen complex. Group I: area size up to 1.9 mm. Group II: area size: 1.9-3.9 mm. Group III: area size > 4.0 mm. Flow (haemodynamic) parameters – maximum systolic velocity (MSV), minimum diastolic velocity (MDV), and resistivity index (RI) and pulsatility index (PI) were recorded in the central retinal artery (CRA), in the central retinal vein (CRV), in the temporal and nasal ciliares posteriores arteries breves (CPAb) and in the ophthalmic artery (OA). The values were divided into 1. Physiological: CRA: 8.7 ± 0.9 / 2.9 ± 0.6 cm/s, or RI: 0.70 ± 0.05, 2. Slightly impaired: CRA: 6.6 ± 0.8 / 2.0 ± 0.5 cm/s, or RI: 0.75 ± 0.04. 3. Significantly impaired: CRA: 5.2 ± 1.2 / 1.9 ± 0.7 cm/s, or RI: 0.79 ± 0.03. Results: No linear relationship was demonstrated between the size of the drusens and flow parameters. Slight impairment of HP in the CRA was present in 28.6% of drusens in group I, 48.3% in group II and 62.4% in group III. Significant impairment of HP in the CRA was present in 28.6% of drusens in group I, 48.3% in group II and 62.4% in group III. HP in the CPAb and OA were not of significant importance with regard to the presence and size of the drusens. The relationship between the individual variables was evaluated with the aid of a Pearson correlation coefficient: 0.213, group I P: 0.354, group II P: 0.073, group III P: 0.287. Conclusions: HP are more often impaired in “large” optic disc drusens (group III), rarely in group I ODDs – though this is not an absolute rule. It is not possible to predict haemodynamic parameters according to the size of the drusen formation in the optic nerve. It appears that impairment of the haemodynamic parameters is conditioned not only by the size of the ODD, but also by the locality (distance from lamina cribriformis) and also the intrapapillary relationship to the vascular system.

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Muth, Daniel Rudolf, Mario Damiano Toro, Anahita Bajka, Kamil Jonak, Roman Rieder, Myrtha Magdalena Kohler, Jeanne Martine Gunzinger et al. "Correlation between Macular Neovascularization (MNV) Type and Druse Type in Neovascular Age-Related Macular Degeneration (AMD) Based on the CONAN Classification". Biomedicines 10, n. 10 (22 settembre 2022): 2370. http://dx.doi.org/10.3390/biomedicines10102370.

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Background: To investigate associations and predictive factors between macular neovascularization (MNV) lesion variants and drusen types in patients with treatment-naïve neovascular age-related macular degeneration (AMD). Methods: Multimodal imaging was retrospectively reviewed for druse type (soft drusen, subretinal drusenoid deposits (SDDs) or mixed) and MNV type (MNV 1, MNV 2, MNV 1/2 or MNV 3). The Consensus on Neovascular AMD Nomenclature (CONAN) classification was used for characterizing MNV at baseline. Results: One eye of each eligible patient was included (n = 191). Patients with predominant SDDs had an increased adjusted odds ratio (aOR) for MNV 2 (23.4453, p = 0.0025) and any type of MNV 3 (8.7374, p < 0.0001). Patients with MNV 1/2 had an aOR for predominant SDDs (0.3284, p = 0.0084). Patients with MNV1 showed an aOR for SDDs (0.0357, p < 0.0001). Eyes with SDDs only without other drusen types showed an aOR for MNV 2 (9.2945, p < 0.0001). Conclusions: SDDs represent a common phenotypic characteristic in AMD eyes with treatment-naïve MNV. The aOR for eyes with predominant SDDs to develop MNV 2 and MNV 3 was much higher, possibly due to their location in the subretinal space. The predominant druse type may help to predict which type of MNV will develop during the course of AMD.

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Gartner, S. "Drusen". Archives of Ophthalmology 103, n. 9 (1 settembre 1985): 1283. http://dx.doi.org/10.1001/archopht.1985.01050090035020.

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Sitaula, S., M. Thapa e AK Sharma. "Optic disc drusen presenting as papilledema: a case report". Journal of Chitwan Medical College 4, n. 1 (30 luglio 2014): 42–44. http://dx.doi.org/10.3126/jcmc.v4i1.10848.

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Optic disc drusens, which are congenital anomalies of optic nerve head, are depositions of mucopolysaccharides and proteinaceous material within the optic nerve head. They are usually bilateral and diagnosed incidentally during routine fundus examination where they may be mistaken for papilledema. We report a case of 63 year old female referred to the neuro-ophthalmology department with the clinical suspicion of disc edema. Simple noninvasive investigations like ultrasound B-scan, fundus autofluorescene along with the newer test like spectral domain optical coherence tomography helped us to diagnose it as a case of pseudopapilledema, as optic disc drusen. Thus, a high index of suspicion along with the ancillary tests is helpful in differentiating optic disc drusen from true papilledema. DOI: http://dx.doi.org/10.3126/jcmc.v4i1.10848 Journal of Chitwan Medical College 2014; 4(1): 42-44

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Belmouhand, Mohamed, Simon P. Rothenbuehler, Sami Dabbah, Jakob Bjerager, Birgit Sander, Jacob B. Hjelmborg, Christine Dalgård, Rasmus Jensen e Michael Larsen. "Small hard drusen and associated factors in early seniority". PLOS ONE 17, n. 12 (22 dicembre 2022): e0279279. http://dx.doi.org/10.1371/journal.pone.0279279.

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Purpose The purpose of this study was to examine the ocular and systemic risk profile of the fundus phenotype ≥ 20 small hard (macular) drusen (< 63 μm in diameter). Methods This single-center, cross-sectional study of 176 same-sex twin pairs aged 30 to 80 (median 60) years was a component of a framework study of the transition from not having age-related macular degeneration to having early AMD. Drusen categories assessed using fundus photography and optical coherence tomography included small hard drusen (diameter < 63 μm), intermediate soft drusen (63–125 μm), and large soft drusen (> 125 μm), of which the soft drusen are compatible with a diagnosis of AMD. Results Having ≥ 20 small hard drusen within or outside the macula was associated with increasing age, lower body mass index, shorter axial length, hyperopia, female sex, increasing high-density lipoprotein (HDL), high alcohol consumption, and with the presence of soft drusen. Conclusions Having ≥ 20 small hard drusen was associated with some AMD-related risk factors, but not with smoking, increasing body mass index, and higher blood pressure. Having ≥ 20 small hard drusen was also associated with soft drusen, in agreement with previous studies. These findings suggest that small hard drusen are not an early manifestation of AMD but the product of a distinct process of tissue alteration that promotes the development of AMD or some subtype thereof.

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D’souza, Yvonne, Carolyn J. P. Jones e Richard Bonshek. "Glycoproteins of drusen and drusen-like lesions". Journal of Molecular Histology 39, n. 1 (11 settembre 2007): 77–86. http://dx.doi.org/10.1007/s10735-007-9130-5.

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BONSHEK, RE, Y. D'SOUZA e C. JONES. "Glycoproteins of drusen and drusen-like lesions". Acta Ophthalmologica Scandinavica 85 (2 ottobre 2007): 0. http://dx.doi.org/10.1111/j.1600-0420.2007.01062_3305.x.

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Pham, Quang T. M., Sangil Ahn, Su Jeong Song e Jitae Shin. "Automatic Drusen Segmentation for Age-Related Macular Degeneration in Fundus Images Using Deep Learning". Electronics 9, n. 10 (1 ottobre 2020): 1617. http://dx.doi.org/10.3390/electronics9101617.

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Drusen are the main aspect of detecting age-related macular degeneration (AMD). Ophthalmologists can evaluate the condition of AMD based on drusen in fundus images. However, in the early stage of AMD, the drusen areas are usually small and vague. This leads to challenges in the drusen segmentation task. Moreover, due to the high-resolution fundus images, it is hard to accurately predict the drusen areas with deep learning models. In this paper, we propose a multi-scale deep learning model for drusen segmentation. By exploiting both local and global information, we can improve the performance, especially in the early stages of AMD cases.

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Suzuki, Mihoko, Christine A. Curcio, Robert F. Mullins e Richard F. Spaide. "REFRACTILE DRUSEN". Retina 35, n. 5 (maggio 2015): 859–65. http://dx.doi.org/10.1097/iae.0000000000000503.

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Querques, Giuseppe, e Eric H. Souied. "Vascularized Drusen". Retina 35, n. 12 (dicembre 2015): 2433–39. http://dx.doi.org/10.1097/iae.0000000000000761.

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Balaratnasingam, Chandrakumar, Svetlana Cherepanoff, Rosa Dolz-Marco, Murray Killingsworth, Fred K. Chen, Randev Mendis, Sarah Mrejen et al. "Cuticular Drusen". Ophthalmology 125, n. 1 (gennaio 2018): 100–118. http://dx.doi.org/10.1016/j.ophtha.2017.08.033.

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Slotnick, Samantha, e Jerome Sherman. "Disc Drusen". Ophthalmology 119, n. 3 (marzo 2012): 652–652. http://dx.doi.org/10.1016/j.ophtha.2011.11.026.

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Tso, M. O. M., e G. A. Fishman. "Drusen-Reply". Archives of Ophthalmology 103, n. 9 (1 settembre 1985): 1283. http://dx.doi.org/10.1001/archopht.1985.01050090035021.

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Kamao, Hiroyuki, Katsutoshi Goto, Kento Matsuno, Kenichi Mizukawa, Atsushi Miki e Junichi Kiryu. "Clinical Characteristics of Neovascular Age-Related Macular Degeneration without Typical Drusen". Journal of Ophthalmology 2021 (27 aprile 2021): 1–8. http://dx.doi.org/10.1155/2021/6683532.

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Purpose. To evaluate the clinical characteristics of neovascular age-related macular degeneration (nAMD) patients without typical drusen. Methods. We retrospectively studied 165 eyes in 165 patients with treatment-naïve nAMD, including typical AMD and polypoidal choroidal vasculopathy (PCV). According to the fellow eye condition, the patients were divided into nAMD with and without typical drusen groups. Eyes with soft drusen or subretinal drusenoid deposits were classified into the nAMD with the typical drusen group. Smoking status and diagnoses of hypertension and diabetes were identified from hospital records and patient recall. We assessed best-corrected visual acuity (BCVA), central retinal thickness (CRT) at the fovea, subfoveal choroidal thickness (SFCT), and the number of injections received. Results. The nAMD without typical drusen group was significantly younger (77.9 ± 7.6 vs. 71.8 ± 8.3, P < 0.001 ) and had thicker SFCT at baseline (207.9 ± 99.5 vs. 260.1 ± 113.2 μm, P = 0.007 ) and a higher proportion of PCV (30.6 vs. 63.1%, P < 0.001 ). The proportion of ever-smokers was significantly higher in the nAMD without typical drusen group (54.8 vs. 70.9%, P = 0.036 ). There were no statistically significant differences in the proportion of patients with hypertension or diabetes; BCVA, CRT, or SFCT changes; or the number of injections between the nAMD with and without typical drusen groups. Conclusion. The clinical features of patients in the nAMD without typical drusen group were almost identical to those of pachychoroid-driven choroidal neovascularization (CNV) patients. The nAMD without typical drusen group had a significantly higher proportion of ever-smokers than the nAMD with typical drusen group. Smoking could be a risk factor for the development of pachychoroid-driven CNV.

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Chen, Qing-Shan, Xia Zhao, Miao-Hong Chen, Yu-Hang Yang e Zhi Li. "Morphological changes of macular soft drusen and drusenoid DPED after subthreshold micropulse laser treatment". International Eye Research 2, n. 2 (28 giugno 2021): 95–100. http://dx.doi.org/10.18240/ier.2021.02.07.

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AIM: To analyze the morphological changes of macular soft drusen and drusenoid pigmental epithelium detachment (DPED) after subthreshold micropulse laser treatment (SMLT). METHODS: Fourteen patients (20 affected eyes) with soft drusen and DPED clinically confirmed from August 2016 to October 2018, were included in this study. 577 nm yellow laser of SMLT was applied for soft drusen and DPED. The changes of soft drusen and DPED in best corrected visual acuity (BCVA)(LogMAR)and height, diameter and cross-sessional area according to fundus autofluorescence and SD-OCT examinations were observed after SMLT RESULTS: BCVA was not significant difference after treatment of soft drusen (P=0.260), and the DPED (P=0.736) than that of the baseline. Compared with the baseline values, the height and cross-sessional area of soft drusen were reduced at the 6mo after treatment, and the differences were statistically significant (P=0.008, P=0.034). Compared with the baseline values, the differences were not statistically significant in height, diameter and cross-sectional area of DPED after treatment. CONCLUSION: BCVA was not reduced for drusen and DPED after SMLT, however, the height and cross-sessional area of soft drusen was reduced compared with those before treatment, and the differences were not statistically significant in height, diameter and cross-sectional area of DPED before and after treatment. The results indicated that SMLT was effective for soft drusen, but was not effective for short-term treatment of DPED. SMLT caused no damage to the visual acuity in treatment of soft drusen and DPED, but prospective, controlled, large sample and long-term follow-up studies should be required.

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Ukalovic, Kresimir, Sijia Cao, Sieun Lee, Qiaoyue Tang, Mirza Faisal Beg, Marinko V. Sarunic, Ging-Yuek R. Hsiung et al. "Drusen in the Peripheral Retina of the Alzheimer’s Eye". Current Alzheimer Research 15, n. 8 (11 giugno 2018): 743–50. http://dx.doi.org/10.2174/1567205015666180123122637.

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Background: Recent work on Alzheimer's disease (AD) diagnosis focuses on neuroimaging modalities; however, these methods are expensive, invasive, and not available to all patients. Ocular imaging of biomarkers, such as drusen in the peripheral retina, could provide an alternative method to diagnose AD. Objective: This study compares macular and peripheral drusen load in control and AD eyes. Methods: Postmortem eye tissues were obtained from donors with a neuropathological diagnosis of AD. Retina from normal donors were processed and categorized into younger (<55 years) and older (>55 years) groups. After fixation and dissection, 3-6 mm punches of RPE/choroid were taken in macular and peripheral (temporal, superior, and inferior) retinal regions. Oil red O positive drusen were counted and grouped into two size categories: small (<63 μm) and intermediate (63-125 μm). Results: There was a significant increase in the total number of macular and peripheral hard drusen in older, compared to younger, normal eyes (p<0.05). Intermediate hard drusen were more commonly found in the temporal region of AD eyes compared to older normal eyes, even after controlling for age (p<0.05). Among the brain and eye tissues from AD donors, there was a significant relationship between cerebral amyloid angiopathy (CAA) severity and number of temporal intermediate hard drusen (r=0.78, p<0.05). Conclusion: Imaging temporal drusen in the eye may have benefit for diagnosing and monitoring progression of AD. Our results on CAA severity and temporal intermediate drusen in the AD eye are novel. Future studies are needed to further understand the interactions among CAA and drusen formation.

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Hristova, Elitsa G., e Zornitsa I. Zlatarova. "Dry Age-Related Macular Degeneration – A New Approach In Optical Coherence Tomography Monitoring And Quantitative Assessment". Journal of Biomedical and Clinical Research 7, n. 2 (1 dicembre 2014): 148–54. http://dx.doi.org/10.1515/jbcr-2015-0141.

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Summary The purpose of the study was to present the ability of Drusen analysis software tool to measure drusen area and volume in patients with dry age-related macular degeneration (AMD). Eleven patients with confirmed dry AMD aged 59-74 years were scanned with 3D OCT-2000 Topcon 3D Macula scanning protocol by a single operator. All subjects underwent a complete ophthalmologic examination including best corrected visual acuity, indirect biomicroscopy, tonometry, fluorescein angiography and OCT. Drusen analysis was performed on the macula with 6.0 × 6.0 mm volume cube scans and 512×128 pixels scan resolution. The results were presented along with calculated values in two clearly arranged reports. Mean follow-up period was 19 months (6-40). Count, area occupation, volume of the drusen and 3D retinal pigment epithelium (RPE) elevation map were presented in a Macula drusen analysis report. Drusen count and volume in 6 patients were increased at the end of follow-up period. There were 5 patients with regression in drusen count and area and volume of the drusen in 3 of them were higher than on previous examination. Another 2 were with regression not only in drusen count but also in their area and volume. With this software tool the status of RPE can be objectively and automatically examined in detail and can be followed up over time. OCT allows for precise quantitative evaluation and study of microstructural changes in patients with dry AMD and provides three-dimensional information of macular pathology in situ and in real time. This could be useful for determining stages and monitoring the progression of AMD.

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Pedersen, Hilde R., Stuart J. Gilson, Alfredo Dubra, Inger Christine Munch, Michael Larsen e Rigmor C. Baraas. "Multimodal imaging of small hard retinal drusen in young healthy adults". British Journal of Ophthalmology 102, n. 1 (19 ottobre 2017): 146–52. http://dx.doi.org/10.1136/bjophthalmol-2017-310719.

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BackgroundSmall hard macular drusen can be observed in the retina of adults as young as 18 years of age. Here, we seek to describe the in vivo topography and geometry of these drusen.MethodsRetinal images were acquired in young, healthy adults using colour fundus photography, spectral domain optic coherence tomography (SD-OCT), reflectance flood-illuminated adaptive optic ophthalmoscopy (AO flood) and reflectance adaptive optic scanning light ophthalmoscopy (AOSLO) in both confocal and non-confocal split-detection modalities. Small bright yellow hard drusen within a 10 degree radius from the foveal centre were characterised.ResultsSmall hard drusen were seen on colour photographs in 21 out of 97 participants and 26 drusen in 12 eyes in 11 participants were imaged using the full protocol. Drusen were easily identifiable in all modalities, except a few very small ones, which were not visible on SD-OCT. On AOSLO images, these drusen appeared as round, oval or lobular areas (up to three lobules) of diameter 22–61 µm where cone photoreceptor reflectivity and density was decreased (p=0.049). This was usually associated with discrete thickening of the retinal pigment epithelium (RPE) complex.ConclusionHigh lateral resolution imaging of small lobular hard retinal drusen suggests formation through the confluence of two or more smaller round lesions. The outline and size of these smaller lesions corresponds to 1–4 RPE cells. Prospective longitudinal studies are needed to determine the ultimate fate of small hard drusen and their potential relation to age-related macular degeneration.

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Danišová, Jana, e Evžen Fric. "Diagnostics of Optic Disc Drusen in Children with Swept Source OCT Imaging". Czech and Slovak Ophthalmology 77, n. 2 (1 maggio 2021): 80–86. http://dx.doi.org/10.31348/2021/11.

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Aim: The aim of this retrospective study is to compare two methods of optic disc drusen imaging in pediatric patients – new swept source OCT technology with the B-scan ultrasonography, which has been assumed to be a gold standard in diagnosing optic disc drusen, and to compare pRNFL thickness in children with optic disc drusen and control group. Methods: 14 eyes of 8 pediatric patients in whom optic disc drusen were confirmed by either B-scan ultrasonography, or swept-source OCT, were included in the study. We compared the sensitivity of these two imaging methods. Then we compared an average pRNFL thickness and pRNFL thickness in all four quadrants of our study group with the control group. Two statistical methods were used in data analysis – Mann-Whitney a Kruskal-Wallis test. Results: The difference between SS-OCT and B-scan ultrasonography was not statistically significant in diagnosing optic disc drusen. Average pRNFL thickness was 135.29 ± SD 31.2 μm in eyes with optic disc drusen, which is 24.15 % higher than in control group (p = 0.00214; p = 0.00207). pRNFL thickness of temporal (p = 0.0001; p = 0.0001), superior (p = 0.03486; p = 0.03361) and inferior (p = 0.00652; p = 0.00627) quadrant was statistically significantly higher in comparison with healthy controls, whereas the difference of pRNFL thickness in nasal quadrant was not statistically significant between the study and control group (p = 0.09692; p = 0.0947). Conclusion: Swept source OCT is a promising new "gold standard" in optic disc drusen diagnostics in pediatric patients. An increase in pRNFL thickness values does not always confirm papilloedema as optic disc drusen may be the cause. Direct visualisation of optic disc drusen by swept source OCT can aid in differentiation from true papilloedema.

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Beck, Marco, Devika S. Joshi, Lieselotte Berger, Gerd Klose, Sandro De Zanet, Agata Mosinska, Stefanos Apostolopoulos et al. "Comparison of Drusen Volume Assessed by Two Different OCT Devices". Journal of Clinical Medicine 9, n. 8 (17 agosto 2020): 2657. http://dx.doi.org/10.3390/jcm9082657.

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To compare drusen volume between Heidelberg Spectral Domain (SD-) and Zeiss Swept-Source (SS) PlexElite Optical Coherence Tomography (OCT) determined by manual and automated segmentation methods. Thirty-two eyes of 24 patients with Age-Related Macular Degeneration (AMD) and drusen maculopathy were included. In the central 1 and 3 mm ETDRS circle drusen volumes were calculated and compared. Drusen segmentation was performed using automated manufacturer algorithms of the two OCT devices. Then, the automated segmentation was manually corrected and compared and finally analyzed using customized software. Though on SD-OCT, there was a significant difference of mean drusen volume prior to and after manual correction (mean difference: 0.0188 ± 0.0269 mm3, p < 0.001, corr. p < 0.001, correlation of r = 0.90), there was no difference found on SS-OCT (mean difference: 0.0001 ± 0.0003 mm3, p = 0.262, corr. p = 0.524, r = 1.0). Heidelberg-acquired mean drusen volume after manual correction was significantly different from Zeiss-acquired drusen volume after manual correction (mean difference: 0.1231 ± 0.0371 mm3, p < 0.001, corr. p < 0.001, r = 0.68). Using customized software, the difference of measurements between both devices decreased and correlation among the measurements improved (mean difference: 0.0547 ± 0.0744 mm3, p = 0.02, corr. p = 0.08, r = 0.937). Heidelberg SD-OCT, the Zeiss PlexElite SS-OCT, and customized software all measured significantly different drusen volumes. Therefore, devices/algorithms may not be interchangeable. Third-party customized software helps to minimize differences, which may allow a pooling of data of different devices, e.g., in multicenter trials.

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White, Robert J., Daniel J. Watson, Dara D. Koozekanani e Sandra R. Montezuma. "Association of Optic Nerve Head Drusen with Best Vitelliform Macular Dystrophy: A Case Series". Case Reports in Ophthalmology 9, n. 1 (26 gennaio 2018): 82–92. http://dx.doi.org/10.1159/000485963.

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Purpose: To report the association of optic nerve head (ONH) drusen with Best vitelliform macular dystrophy (BVMD). Methods: Chart review. Patients: Five patients from 3 families. Results: Multimodal imaging and ophthalmic examination demonstrated findings consistent with ONH drusen, in association with BVMD, in 5 patients. Conclusion: We report the association of BVMD with ONH drusen in 5 patients. This combination has previously been reported only once. We recommend that patients with a diagnosis of BVMD undergo autofluorescence and ultrasound imaging of the optic nerve to help facilitate this diagnosis, as some ONH drusen can be buried.

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Кабанова, Evgeniya Kabanova, Иойлева, Elena Ioyleva, Котова e Elena Kotova. "POSSIBILITIES OF MODERN IMAGING TECHNIQUES IN DIAGNOSTICS OF OPTIC NERVE DRUSEN (LITERATURE REVIEW)". Бюллетень Восточно-Сибирского научного центра Сибирского отделения Российской академии медицинских наук 1, n. 6 (20 dicembre 2016): 206–9. http://dx.doi.org/10.12737/23842.

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Abstract (sommario):

With the introduction and development of new diagnostic techniques, the relevance of drusen of the optic nerve di-agnostics is increasing. Existing imaging techniques alone or in their various combinations cannot allow to confirm optic nerve drusen in all clinical cases. The diagnosis of optic nerve drusen causes some difficulties because of absence of clear diagnostic standards and classification. Since the advent of new ophthalmological methods of structural and topographic visual analysis evaluation, such as spectral-domain optical coherence tomography, Heidelberg retina tomography, videooculography, B-scan ultrasonography of the orbits and optic nerve, fluorescent angiography of the retina, computed tomography and magnetic resonance imaging of the brain and orbits, the diagnostics of optic nerve drusen becomes more informative. In this article we review the main current imaging techniques in the diagnostics of the optic nerve drusen.

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Rodríguez, Anabel, Marc Biarnés, Rosa M. Coco-Martin, Anna Sala-Puigdollers e Jordi Monés. "Early Detection of Incipient Retinal Pigment Epithelium Atrophy Overlying Drusen with Fundus Autofluorescence vs. Spectral Domain Optical Coherence Tomography". Journal of Ophthalmology 2020 (16 settembre 2020): 1–8. http://dx.doi.org/10.1155/2020/9457457.

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Purpose. This study aims to find out which tool, fundus autofluorescence (FAF) or spectral domain optical coherence tomography (SD-OCT), is more sensitive in detecting retinal pigment epithelium (RPE) demise overlying drusen and can, therefore, help predict geographic atrophy (GA) appearance in Age-Related Macular Degeneration (AMD). Methods. A single-site, retrospective, observational, longitudinal study was conducted. Patients with intermediate AMD (iAMD) (large (>125 μm) or intermediate (63–125 μm) drusen with hyper/hypopigmentation) with a minimum follow-up of 18 months were included. Drusen with overlying incipient RPE atrophy were identified on SD-OCT defined as choroidal hypertransmission or nascent geographic atrophy (nGA). These selected drusen were, then, traced backwards in time to determine if incipient RPE atrophy overlying drusen was observed on FAF (well-demarcated region of absence of autofluorescence) before, simultaneously, or after having detected the first signs of incipient RPE atrophy on SD-OCT. The number of drusen in which signs of incipient RPE atrophy was detected earlier using FAF or SD-OCT was compared. The time elapsed from the identification with the more sensitive method to the other was recorded and analyzed. Results. One hundred and thirty-three drusen in 22 eyes of 22 patients were included. Of these, 112 (84.2%) drusen showed choroidal hypertransmission and 21(15.8%) nGA. Early signs of atrophy overlying drusen were found simultaneously on SD-OCT and FAF in 52 cases (39.1%, 95% CI 30.8–47.9%), earliest on FAF in 51 (38.3%, 95% CI 30.0–47.2%) and first on SD-OCT in 30 (22.6%, 95% CI 15.8–30.6%; p<0.05). Statistically significant differences were found between both techniques (p=0.005), with FAF detecting it earlier than SD-OCT. When RPE atrophy was found first on FAF, the median time to diagnosis with SD-OCT was 6.6 months (95% CI 5.5 to 8.6), while if detection occurred earlier on SD-OCT, the median time until identification with FAF was 12.6 months (95% CI 6.0 to 23.4; p=0.0003). Conclusions. In iAMD cases in which early atrophy overlying drusen is not detected simultaneously in FAF and SD-OCT, FAF was significantly more sensitive. Nevertheless, a multimodal approach is recommended and required to evaluate these patients.

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López-Cuenca, Inés, Elena Salobrar-García, Inés Gil-Salgado, Lidia Sánchez-Puebla, Lorena Elvira-Hurtado, José A. Fernández-Albarral, Federico Ramírez-Toraño et al. "Characterization of Retinal Drusen in Subjects at High Genetic Risk of Developing Sporadic Alzheimer’s Disease: An Exploratory Analysis". Journal of Personalized Medicine 12, n. 5 (23 maggio 2022): 847. http://dx.doi.org/10.3390/jpm12050847.

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Having a family history (FH+) of Alzheimer’s disease (AD) and being a carrier of at least one ɛ4 allele of the ApoE gene are two of the main risk factors for the development of AD. AD and age-related macular degeneration (AMD) share one of the main risk factors, such as age, and characteristics including the presence of deposits (Aβ plaques in AD and drusen in AMD); however, the role of apolipoprotein E isoforms in both pathologies is controversial. We analyzed and characterized retinal drusen by optical coherence tomography (OCT) in subjects, classifying them by their AD FH (FH- or FH+) and their allelic characterization of ApoE ɛ4 (ApoE ɛ4- or ApoE ɛ4+) and considering cardiovascular risk factors (hypercholesterolemia, hypertension, and diabetes mellitus). In addition, we analyzed the choroidal thickness by OCT and the area of the foveal avascular zone with OCTA. We did not find a relationship between a family history of AD or any of the ApoE isoforms and the presence or absence of drusen. Subjects with drusen show choroidal thinning compared to patients without drusen, and thinning could trigger changes in choroidal perfusion that may give rise to the deposits that generate drusen.

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Parameswarappa, Deepika Chennapura, e Padmaja Kumari Rani. "Utility of pattern recognition and multimodal imaging in the diagnosis and management of doyne honeycomb retinal dystrophy complicated with type one choroidal neovascular membrane". BMJ Case Reports 14, n. 2 (febbraio 2021): e237635. http://dx.doi.org/10.1136/bcr-2020-237635.

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A 44-year-old woman presented with decreased vision in both eyes. The retina in both eyes had drusen distributed along vascular arcades, central macula and in peripapillary region. Macula had pigmented scarring and exudation. Fundus autofluorescence showed drusen. Optical coherence tomography showed drusen, subretinal and intraretinal fluid. Fundus fluorescein and indocyanine green angiography showed drusen, retinal pigment epithelial atrophy and vascular network. Younger age at presentation, bilateral symmetry, typical distribution of drusen along the arcades in a radiating pattern, peripapillary involvement, scarring and atrophy at macula were suggestive of doyne honeycomb retinal dystrophy. The reduced vision was due to macular atrophy and an active choroidal neovascular membrane. The patient was treated with antivascular endothelial growth factor injections for choroidal neovascular membrane. Our case highlights the importance of pattern recognition and multimodal imaging for diagnosing the type of macular dystrophy as doyne honeycomb retinal dystrophy, while simultaneously managing choroidal neovascular membrane.

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Nittala, Muneeswar G., Federico Corvi, Jyotsna Maram, Swetha B. Velaga, Jonathan Haines, Margaret A. Pericak-Vance, Dwight Stambolian e SriniVas R. Sadda. "Risk Factors for Progression of Age-Related Macular Degeneration: Population-Based Amish Eye Study". Journal of Clinical Medicine 11, n. 17 (30 agosto 2022): 5110. http://dx.doi.org/10.3390/jcm11175110.

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Objective: To evaluate the optical coherence tomography (OCT)-based risk factors for progression to late age-related macular degeneration (AMD) in a population-based study of elderly Amish. Methods: A total of 1332 eyes of 666 consecutive subjects who completed a 2-year follow-up visit were included in this multicenter, prospective, longitudinal, observational study. Imaging features were correlated with 2-year incidence of late AMD development. Odds ratios for imaging features were estimated from logistic regression. Baseline OCT images were reviewed for the presence of drusen volume ≥0.03 mm3 in the central 3 mm ring, intraretinal hyperreflective foci (IHRF), hyporeflective drusen cores (hDC), subretinal drusenoid deposits (SDD), and drusenoid pigment epithelium detachment (PED). Subfoveal choroidal thickness, drusen area, and drusen volume within 3 and 5 mm circles centered on the fovea were also assessed. Results: Twenty-one (1.5%) of 1332 eyes progressed to late AMD by 2 years. The mean age of the study subjects was 65 ± 10.17 (±SD) years and 410 subjects were female. Univariate logistic regression showed that drusen area and volume in both 3 mm and 5 mm circles, subfoveal choroidal thickness, drusen volume ≥ 0.03 mm3 in the 3 mm ring, SDD, IHRF, and hDC were all associated with an increased risk for development of late AMD. The multivariate regression model identified that drusen volume in the 3 mm ring (OR: 2.59, p = 0.049) and presence of IHRF (OR: 57.06, p < 0.001) remained as independent and significant risk factors for progression to late AMD. Conclusions: This population-based study confirms previous findings from clinic-based studies that high central drusen volume and IHRF are associated with an increased risk of progression to late AMD. These findings may be of value in risk-stratifying patients in clinical practice or identifying subjects for early intervention clinical trials.

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Sato, Atsuko, Nami Senda, Emi Fukui e Kouichi Ohta. "Retinal Angiomatous Proliferation in an Eye with Cuticular Drusen". Case Reports in Ophthalmology 6, n. 1 (1 aprile 2015): 127–31. http://dx.doi.org/10.1159/000381616.

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Purpose: To report the presence of retinal angiomatous proliferation (RAP) in an eye with cuticular drusen detected by fluorescein and indocyanine green angiography by confocal scanning laser ophthalmoscopy and by spectral-domain optical coherence tomography (SD-OCT). Methods: Case report of a 65-year-old Japanese woman with cuticular drusen. Results: At her first ophthalmic examination, her visual acuity was 20/20 in both eyes. An ophthalmoscopy showed many small subretinal pigment epithelial deposits in both eyes. These deposits had a ‘saw-tooth pattern' in the SD-OCT images. During the follow-up examination, retinal hemorrhages were observed, and fluorescein angiography showed a ‘stars-in-the-sky' appearance and intraretinal neovascularization. The patient was diagnosed with cuticular drusen associated with RAP. Conclusion: We suggest that the cuticular drusen were associated with RAP, so periodic follow-up examinations are needed for patients with cuticular drusen for the early detection and treatment of RAP.

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Giuffrè, G. "Optic Disc Drusen in Tilted Disc". European Journal of Ophthalmology 15, n. 5 (settembre 2005): 647–51. http://dx.doi.org/10.1177/112067210501500518.

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Abstract (sommario):

Purpose To investigate if a congenital anomaly of the head of the optic nerve like such as tilted disc can be a risk factor for the development of optic disc drusen. Methods The study was performed retrospectively on the files of 47 patients with optic disc drusen. The diagnosis was confirmed by fluorescein angiography and B-scan ultrasonography. The authors examined the fundus photographs and the fluorescein angiographies of these patients looking for the presence of tilted discs. Results Two of the 47 patients with optic nerve drusen had tilted discs as well, about twice the expected rate. Both cases presented a parapapillary hemorrhage. Conclusions The concomitant presence of tilted disc and optic disc drusen can have a cause-effect relationship. The axonal crowding in a scleral canal of reduced size, as seen in tilted disc, can compress the nerve fibers against the stiff lamina cribrosa, producing a chronic optic neuropathy leading to drusen.

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Morgan, William H. "Macular drusen quantitation". Ophthalmology 107, n. 6 (giugno 2000): 1019. http://dx.doi.org/10.1016/s0161-6420(99)00171-2.

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Auw-Haedrich, Claudia, Flemming Staubach e Heinrich Witschel. "Optic Disk Drusen". Survey of Ophthalmology 47, n. 6 (novembre 2002): 515–32. http://dx.doi.org/10.1016/s0039-6257(02)00357-0.

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Abeysiri, Poorna, Sobha Sivaprasad e David Trew. "Optic disc drusen". Lancet 362, n. 9382 (agosto 2003): 468. http://dx.doi.org/10.1016/s0140-6736(03)14074-3.

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Barondes, M., D. Pauleikhoff, I. C. Chisholm, D. Minassian e A. C. Bird. "Bilaterality of drusen." British Journal of Ophthalmology 74, n. 3 (1 marzo 1990): 180–82. http://dx.doi.org/10.1136/bjo.74.3.180.

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Kim, Sukjin, Jeongjae Oh e Kiseok Kim. "Morphologic Changes in Patient with Drusen and Drusenoid Pigment Epithelial Detachment after Intravitreal Ranibizumab for Choroidal Neovascular Membrane : A Case Report". Open Ophthalmology Journal 10, n. 1 (4 febbraio 2016): 1–4. http://dx.doi.org/10.2174/1874364101610010001.

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The authors present a case of morphologic changes of drusen and drusenoid pigment epithelial detachment (DPED) after treating choroidal neovascularization (CNV) using ranibizumab in age-related macular degeneration (AMD). A 71-year-old woman has noticed mild visual acuity deterioration in the right eye for several months. She was presented with some drusen and DPED associated with CNV. This patient was given intravitreal injection of 0.5 mg of ranibizumab five times at monthly intervals for treating CNV. DPED in the temporal and drusen in the superior to macula were diminished, which continued up to 2 months. Intravitreal ranibizumab injection may have influenced with diminishment of drusen and DPED. After 2 months, CNV was recurred.

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Landa, G., A. Springer, A. Bukelman e A. Pollack. "The Diagnostic Contribution of Indocyanine Green to Fluorescein Angiography in Fellow Drusen Eyes of Patients with Wet Age-Related Macular Degeneration". European Journal of Ophthalmology 17, n. 4 (luglio 2007): 615–19. http://dx.doi.org/10.1177/112067210701700421.

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Purpose To assess the contribution of indocyanine green angiography (ICGA) to fluorescein angiography (FA) in evaluating fellow drusen eyes of patients with wet age-related macular degeneration (AMD) in the other eye. Methods The records of paired FA and ICGA of patients with dry AMD in one eye and wet AMD in the other eye were retrospectively reviewed. Based on color fundus photographs, drusen were graded to low, moderate, or high grade of severity on FA. The FA and ICGA findings were compared. Results Fifty-two pairs of eyes were included. Fluorescein angiography showed drusen of low severity in 11 (21.2%) eyes, of moderate severity in 31 (59.6%), and of high severity in 10 (19.2%). Leakage on both FA and ICGA was not demonstrated in any case of drusen of low or moderate severity. Only in 2 out of 10 eyes from the high severity group, 3.8% of the eyes of the whole study population, did ICGA reveal occult choroidal neovascularization (CNV) that was not observed on FA. Conclusions In selected eyes with drusen of high grade severity, ICGA may detect occult CNV, unrecognized clinically or by FA. ICGA had a small contribution to the diagnosis of occult CNV in fellow drusen eyes with any degree of severity.

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D’souza, Yvonne B., Carolyn J. P. Jones, Colin D. Short e Richard E. Bonshek. "Basal laminar drusen and soft drusen have similar glycan composition". Canadian Journal of Ophthalmology 45, n. 3 (giugno 2010): 297–99. http://dx.doi.org/10.3129/i09-232.

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Ioyleva, E. E., e S. I. Belianina. "Treatment of the subretinal neovascularization associated with optic nerve head drusen". Russian ophthalmology of children, n. 3 (7 novembre 2022): 51–57. http://dx.doi.org/10.25276/2307-6658-2022-3-51-57.

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Purpose. To describe a rare clinical case of bilateral choroidal neovascularization (CNV) associated with optic nerve head (ONH) drusen and to report a positive functional and clinical outcome of intravitreal injections of vascular endothelial growth factor inhibitors (anti-VEGF) in this patient. Material and methods. A 39-year-old man with ONH drusen complained of decreased visual acuity and distortion of objects. During the examination, the bilateral CNV was detected in peripapillary area. The patient received two consecutive intravitreal injections of anti-VEGF in the right eye and one injection in the left eye. Results. After the treatment, reabsorption of subretinal fluid and an increase of visual acuity were observed. There were no complications associated with injections. The best-corrected visual acuity remains stabilized at 20/20 at three years of followup. According to the optical coherence tomography parameters, there was no negative dynamics of CNV. Conclusion. ONH drusen may cause several complications, including the development of CNV and significant decrease in visual acuity, due to the CNV progression. Follow-up of patients with ONH drusen is necessary for early diagnosis and treatment of complications. The differential sign of CNV associated with ONH drusen is a localization in the peripapillary area nasal to the fovea. A search of the literature revealed only a few publications on the use of anti-VEGF in patients with CNV associated with ONH drusen. This method was effective and demonstrated positive functional and clinical outcome in the presented clinical case. Key word: subretinal neovascularization; choroidal neovascularization; optic nerve head drusen; optical coherence tomography; antivascular endothelial growth factor therapy

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Trenkic-Bozinovic, Marija, Predrag Jovanovic, Gordana Zlatanovic, Dragan Veselinovic, Aleksandra Aracki-Trenkic e Milan Trenkic. "Retinal hemorrhages as one of complications of optic disc drusen during pregnancy". Medical review 67, n. 5-6 (2014): 185–89. http://dx.doi.org/10.2298/mpns1406185t.

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Abstract (sommario):

Introduction. Drusen of the optic nerve head are relatively benign and asymptomatic. They represent retinal hyaline corpuscles resulting from impaired axoplasmic transport of the retinal ganglion cells of optic nerve in front of the lamina cribrosa. They are usually detected accidentally, during a routine ophthalmologic examination. Most patients with optic disc drusen are not aware of the deterioration of their eyesight because of the slow progression of visual field defects. Damage in visual acuity due to optic disc drusen is rare. Case Report. A 27-year-old female patient in the sixth month of pregnancy visited an ophthalmologist because of a visual impairment described as the appearance of mist and shadows over her right eye. When first examined, her visual acuity in both eyes was 20/20. The retinal hemorrhages framing the bottom half of the optic nerve were seen. Complete laboratory and clinical testing as well as specific ophthalmic examinations (photofundus, computerized visual field, optical coherence tomography, and ultrasound) were performed to exclude systemic causes and they presented no risk for the pregnancy. Echosonographic examination confirmed the presence of bilateral optic nerve head drusen. Conclusion. Hemodynamic changes during pregnancy are possible factors for the development of optical disc and retinal hemorrhages. Since treatment of optic disc drusen is limited, recognition of optic nerve drusen as a cause of hemorrhage during pregnancy prevents unnecessary diagnostic and therapeutic interventions.

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Notomi, Shoji, Satomi Shiose, Keijiro Ishikawa, Yosuke Fukuda, Kumiko Kano, Kenichiro Mori, Iori Wada et al. "Drusen and pigment abnormality predict the development of neovascular age-related macular degeneration in Japanese patients". PLOS ONE 16, n. 7 (27 luglio 2021): e0255213. http://dx.doi.org/10.1371/journal.pone.0255213.

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Abstract (sommario):

Drusen are known to be the important hallmark to predict the development of age-related macular degeneration (AMD). The prevalence of drusen is lower in Asians compared with Caucasians so that the role of signs constituting early AMD is not well established in Asian populations as in Western countries. In this study, we retrospectively investigated clinical characteristics and 5-year incidence of neovascular AMD (nAMD) in the fellow eye of unilateral nAMD patients. Of 296 consecutive unilateral nAMD patients who had been followed up more than 5 years, 170 typical AMD, 119 polypoidal choroidal vasculopathy, and 7 retinal angiomatous proliferation were included. To examine factors associated with nAMD occurrence in the fellow eye, drusen and pigmentary abnormality in the fellow eye were classified into 4 categories; Category 1: no or small drusen < 63 μm (37.2%), Category 2: 63–125 μm medium drusen or pigmentary abnormality (22.2%), Category 3: large drusen > 125 μm (25.0%), Category P: pachydrusen (15.5%). The mean sub-foveal choroidal thickness (SFCT) was Category 1: 276 μm, Category 2: 308 μm, Category 3: 246 μm, and Category P: 302 μm, respectively. Of note, SFCT in Category 2 and Category P was significantly larger than those of Category 3. Finally, the 5-year incidence of nAMD in the fellow eye was 32/296 (10.8%); Category 1: 0/110 (0%), Category 2: 12/66 (18.2%), Category 3: 20/74 (27.0%), and Category P: 0/46 (0%). Thus, signs of intermediate AMD (large drusen) as well as those of early AMD, especially the pigmentary abnormality, may contribute to development of bilateral nAMD in Japanese patients.

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Ayhan, Ziya, Aylin Yaman, Meltem Söylev Bajin e A. Osman Saatci. "Unilateral Acute Anterior Ischemic Optic Neuropathy in a Patient with an Already Established Diagnosis of Bilateral Optic Disc Drusen". Case Reports in Ophthalmological Medicine 2015 (2015): 1–4. http://dx.doi.org/10.1155/2015/730606.

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Optic disc drusen (ODD) are calcific deposits that form in the optic nerve head secondary to abnormalities in axonal metabolism and degeneration. Anterior ischemic optic neuropathy, central retinal artery, and vein occlusion are among the rare vascular complications of disc drusen. We reported the clinical course of a 51-year-old patient with a unilateral acute nonarteritic anterior ischemic optic neuropathy (NAION) who received the diagnosis of bilateral optic disc drusen five years earlier and thereby reiterated the association of ODD and acute NAION.

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Савина, Yuliya Savina, Юрьева, Tatyana Yureva, Щуко, Andrey Shchuko, Самсонов e Dmitriy Samsonov. "INFLUENCE OF OPTIC NERVE DRUSEN ON VISUAL FUNCTIONS IN CHILDREN AND ADOLESCENTS WITH ESSENTIAL ARTERIAL HYPERTENSION". Бюллетень Восточно-Сибирского научного центра Сибирского отделения Российской академии медицинских наук 1, n. 6 (20 dicembre 2016): 148–52. http://dx.doi.org/10.12737/23797.

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The article presents data examination of children and male adolescents, aged 8 to 17years without eye pathologies, with primary hypertension diagnosis – established at the clinic of Scientific Centre for Family Health and Human Re-production Problems. Examination results were: 42patients (84eyes) had primary hypertension with optic disc drusen, 8patients (16eyes) had primary hypertension without optic disc drusen.Characteristics of basic functional changes of patients ophthalmic status with and without optic disc drusen on the basis of data of visometry refractometry, keratometry, computer perimetry, ultrasonic ehobiometry. Doppler angio-graphic examination of ocular vessels, electroretinography (ERG) according to registration standards proposed by the International Society of Clinical electrophysiology of (ISCEV), visual-evoked potentials (VEP), biomicroscopy of the eye, fundus photo registration.To verify and differentiate the prominence of the optic disc drusen in cases of the prominence of stagnant disc with characteristic extension of perineural space, all patients underwent an ultrasound scan procedure of the eyeball. The study obtained data on early pre-clinical manifestations of hypertensive angiohorioretinopaty.The risk factors for the formation of drusen of the optic nerve were identified. We determined that the presence of drusen does not lead to the aggravation of the changes of the visual system, formed under the influence of high blood pressure, affecting only the indicators characterizing ischemic processes in the retina and the optic nerve, which is due to the influence of compression of drusen on glial tissue and the vascular wall.

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Kim, Young Jae, e Kwang Gi Kim. "Automated Segmentation Methods of Drusen to Diagnose Age-Related Macular Degeneration Screening in Retinal Images". Computational and Mathematical Methods in Medicine 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/6084798.

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Existing drusen measurement is difficult to use in clinic because it requires a lot of time and effort for visual inspection. In order to resolve this problem, we propose an automatic drusen detection method to help clinical diagnosis of age-related macular degeneration. First, we changed the fundus image to a green channel and extracted the ROI of the macular area based on the optic disk. Next, we detected the candidate group using the difference image of the median filter within the ROI. We also segmented vessels and removed them from the image. Finally, we detected the drusen through Renyi’s entropy threshold algorithm. We performed comparisons and statistical analysis between the manual detection results and automatic detection results for 30 cases in order to verify validity. As a result, the average sensitivity was 93.37% (80.95%~100%) and the average DSC was 0.73 (0.3~0.98). In addition, the value of the ICC was 0.984 (CI: 0.967~0.993, p<0.01), showing the high reliability of the proposed automatic method. We expect that the automatic drusen detection helps clinicians to improve the diagnostic performance in the detection of drusen on fundus image.

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De Bats, Flore, Benjamin Wolff, Martine Mauget-Faÿsse, Isabelle Meunier, Philippe Denis e Laurent Kodjikian. "Association of Reticular Pseudodrusen and Early Onset Drusen". ISRN Ophthalmology 2013 (16 maggio 2013): 1–9. http://dx.doi.org/10.1155/2013/273085.

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Purpose. To report an association between reticular pseudodrusen, located above the retinal pigment epithelium (RPE), and Early Onset Drusen (EOD) as described using Spectral-Domain Optical Coherence Tomography (SD-OCT). Methods. Eight patients (16 eyes) with EOD were examined. EOD were classified into three entities called Large Colloid Drusen (LCD), Malattia Leventinese (ML), and Cuticular Drusen (CD). Best-corrected visual acuity, fundus examination, color fundus photographs, fundus autofluorescence (FAF), fluorescein angiography (FA), indocyanine green angiography (ICGA), and SD-OCT were performed in all study patients. Results. Four patients had LCD, 2 had ML, and 2 had CD. Reticular pseudodrusen were observed with SD-OCT in all study patients; all these patients had hyperreflective lesions above and below the RPE. Conclusion. Early Onset Drusen appear to be associated with reticular pseudodrusen. SD-OCT is helpful in distinguishing the location of the deposits that are above and below the RPE in EOD. Further studies are needed to understand the role of reticular pseudodrusen in the pathophysiology of EOD.

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Galloway, Chad A., Sonal Dalvi, Sandy S. C. Hung, Leslie A. MacDonald, Lisa R. Latchney, Raymond C. B. Wong, Robyn H. Guymer et al. "Drusen in patient-derived hiPSC-RPE models of macular dystrophies". Proceedings of the National Academy of Sciences 114, n. 39 (6 settembre 2017): E8214—E8223. http://dx.doi.org/10.1073/pnas.1710430114.

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Abstract (sommario):

Age-related macular degeneration (AMD) and related macular dystrophies (MDs) are a major cause of vision loss. However, the mechanisms underlying their progression remain ill-defined. This is partly due to the lack of disease models recapitulating the human pathology. Furthermore, in vivo studies have yielded limited understanding of the role of specific cell types in the eye vs. systemic influences (e.g., serum) on the disease pathology. Here, we use human induced pluripotent stem cell-retinal pigment epithelium (hiPSC-RPE) derived from patients with three dominant MDs, Sorsby’s fundus dystrophy (SFD), Doyne honeycomb retinal dystrophy/malattia Leventinese (DHRD), and autosomal dominant radial drusen (ADRD), and demonstrate that dysfunction of RPE cells alone is sufficient for the initiation of sub-RPE lipoproteinaceous deposit (drusen) formation and extracellular matrix (ECM) alteration in these diseases. Consistent with clinical studies, sub-RPE basal deposits were present beneath both control (unaffected) and patient hiPSC-RPE cells. Importantly basal deposits in patient hiPSC-RPE cultures were more abundant and displayed a lipid- and protein-rich “drusen-like” composition. Furthermore, increased accumulation of COL4 was observed in ECM isolated from control vs. patient hiPSC-RPE cultures. Interestingly, RPE-specific up-regulation in the expression of several complement genes was also seen in patient hiPSC-RPE cultures of all three MDs (SFD, DHRD, and ADRD). Finally, although serum exposure was not necessary for drusen formation, COL4 accumulation in ECM, and complement pathway gene alteration, it impacted the composition of drusen-like deposits in patient hiPSC-RPE cultures. Together, the drusen model(s) of MDs described here provide fundamental insights into the unique biology of maculopathies affecting the RPE–ECM interface.

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Cekić, Sonja, Gordana Stanković-Babić, Zlatica Višnjić, Ivan Jovanović e Dijana Risimić. "Optic Disc Abnormalities – Diagnosis, Evolution and Influence on Visual Acuity". Bosnian Journal of Basic Medical Sciences 10, n. 2 (20 maggio 2010): 125–32. http://dx.doi.org/10.17305/bjbms.2010.2711.

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Abstract (sommario):

Congenital abnormalities of the optic disc are not so rare. The etiology for the most of them is unknown. Visual acuity of affected eye may be minimally or severely affected, depending on the extent of lesion. All of these conditions can be unilateral or bilateral. Chíldren who have unilateral optic disc abnormalities generally present during the preschool years with sensory esotropia. Visual acuity may be unaffected like in optic disc pit, optic disc drusen, fibre medullares, ect. However, during the evolution they may cause a decrease in visual acuity like serous retinal detachment in optic disc pit, atrophy or subretinal neovascularisation in optic disc drusen. Some of them like fibre medullares needs only a good diagnose and they do not have any evolution. Fluorescein angiography and ultrasonography may be crucial diagnostic procedures to discover some of them, like optic disc drusen. Optic disc abnormalities may be associated with other congenital disorders of the eye and often central nervous system malformations. Secondary they may be associated retinal detachment, retinochisis, macular edema, choroid neovascularisation and lipid exudation. Some of these conditions may be found on routine ophthalmologic exam such as optic disc drusen and fibre medullares and often are diagnostically problem.The aim of our study was to present some of our cases with different optic disc abnormalities such as fibre medullares, optic disc coloboma, hypoplasio disci, optic disc drusen and optic disc pit.

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Shields, CarolL, ElizabethB Elimimian e FairoozP Manjandavida. "Soft drusen or not?" Indian Journal of Ophthalmology 66, n. 1 (2018): 9. http://dx.doi.org/10.4103/ijo.ijo_1200_17.

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Goh, Kai Lyn, Carla J. Abbott, Xavier Hadoux, Maxime Jannaud, Lauren A. B. Hodgson, Peter van Wijngaarden, Robyn H. Guymer e Zhichao Wu. "Hyporeflective Cores within Drusen". Ophthalmology Retina 6, n. 4 (aprile 2022): 284–90. http://dx.doi.org/10.1016/j.oret.2021.11.004.

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Davis, Patricia, e Walter Jay. "Optic nerve head drusen". Seminars in Ophthalmology 18, n. 4 (gennaio 2003): 222–42. http://dx.doi.org/10.1080/08820530390895244.

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Crabb, J. W. "The Proteomics of Drusen". Cold Spring Harbor Perspectives in Medicine 4, n. 7 (5 maggio 2014): a017194. http://dx.doi.org/10.1101/cshperspect.a017194.

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