1
|
Akilesh MS, Kumar V, Sinha A, Azad S, Chawla R, Vohra R, Venkatesh P. Ultra-wide field indocyanine green angiography in central serous chorioretinopathy. Indian J Ophthalmol 2024; 72:S606-S609. [PMID: 38770620 DOI: 10.4103/ijo.ijo_1852_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 01/16/2024] [Indexed: 05/22/2024] Open
Abstract
PURPOSE To study ultra-widefield indocyanine green angiography (ICGA) patterns in central serous chorioretinopathy (CSC). METHODS A cross-sectional observational study was undertaken on 30 patients aged 20 to 60 years with CSC at the retina clinic of a tertiary care center. Of them, 43 eyes were affected by CSC, whereas 17 eyes were unaffected as the bilateral disease was observed in 13 patients. All patients were evaluated for best-corrected visual acuity, intraocular pressure, detailed slit-lamp bio-microscopy, indirect ophthalmoscopy, ultra-widefield imaging for pseudo color photograph, fundus autofluorescence (FAF), fundus fluorescein angiography (FFA), and ICGA, and macular swept-source optical coherence tomography (SSOCT) characteristics. RESULTS The mean age of patients was 41.43 ± 8.81 years (range: 25-59 years). The median log MAR visual acuity in CSC eyes was 0.30 (range: 0.17-1.0), whereas it was 0 in non-CSC fellow eyes ( P < 0.001). Pachy-vessels and late hyperpermeability on ultra-widefield ICGA were observed in all eyes. Vortex vein anastomosis was present in 93% of the affected eyes versus 88.2% in unaffected fellow eyes ( P = 0.61). Disc and posterior poles were the sites of the maximum number of anastomoses in both affected and unaffected eyes ( P = 0.77). Asymmetry in vortex vein drainage of the macula was present in 88.4% of affected eyes and 88.2% of unaffected eyes. CONCLUSION Studying the ICGA findings in CSC patients emphasized the role of choroidal circulation in pathogenesis as Pachy vessels were observed in all eyes affected with CSC and even fellow eyes of patients. Vortex vein anastomosis around the disc or posterior pole and asymmetric drainage from the macula were noted and could be contributing to CSC pathology.
Collapse
Affiliation(s)
- M S Akilesh
- Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
| | | | | | | | | | | | | |
Collapse
|
2
|
He G, Zhang X, Zhuang X, Zeng Y, Chen X, Gan Y, Su Y, Zhang Y, Wen F. Diurnal Variation in Choroidal Parameters Among Healthy Subjects Using Wide-Field Swept-Source Optical Coherence Tomography Angiography. Transl Vis Sci Technol 2024; 13:16. [PMID: 38767903 PMCID: PMC11114611 DOI: 10.1167/tvst.13.5.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 04/04/2024] [Indexed: 05/22/2024] Open
Abstract
Purpose The purpose of this study was to evaluate the diurnal variation in choroidal parameters in a wide field area among healthy subjects and to identify correlations between choroidal luminal area and stromal area and various systemic factors. Methods In this cross-sectional study, 42 eyes from 21 healthy participants (mean age = 32.4 ± 8.8 years) were examined using wide-field swept-source optical coherence tomography angiography (WF SS-OCTA, 24 mm × 20 mm). Measurements of choroidal parameters, including choroidal volume (CV), choroidal thickness (CT), choroidal vessel volume (CVV), and choroidal stromal volume (CSV), were taken at 8:00, 12:00, 18:00, and 22:00. Systemic factors, such as blood pressure and heart rate, were concurrently monitored. Results Our study observed significant diurnal variations in the mean total CV, CT, CVV, and CSV, with minimum measurements around 12:00 (P < 0.001) and peak values at 22:00 (P < 0.001). Furthermore, changes in CV in specific regions were more closely associated with fluctuations in CVV than CSV in the same regions. No significant diurnal variations were found in systolic (P = 0.137) or diastolic blood pressure (P = 0.236), whereas significant variations were observed in the heart rate (P = 0.001). Conclusions Our study reveals diurnal variations in choroidal parameters and their associations, emphasizing that changes in choroidal volume relate more to the luminal than the stromal area in vessel-rich regions. This enhances our understanding of choroidal-related ocular diseases. Translational Relevance Regions with higher choroidal vasculature observed greater choroidal volume changes.
Collapse
Affiliation(s)
- Guiqin He
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Xiongze Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Xuenan Zhuang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Yunkao Zeng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Xuelin Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Yuhong Gan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Yongyue Su
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Yining Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| | - Feng Wen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangzhou, China
| |
Collapse
|
3
|
He G, Zhang X, Zhuang X, Zeng Y, Gan Y, Su Y, Li M, Ji Y, Mi L, Chen X, Wen F. A Novel Exploration of the Choroidal Vortex Vein System: Incidence and Characteristics of Posterior Vortex Veins in Healthy Eyes. Invest Ophthalmol Vis Sci 2024; 65:21. [PMID: 38334703 PMCID: PMC10860687 DOI: 10.1167/iovs.65.2.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 01/23/2024] [Indexed: 02/10/2024] Open
Abstract
Purpose The purpose of this study was to investigate the incidence and characteristics of posterior vortex veins (PVVs) in healthy eyes and explore their relationship with age and refractive status. Methods This retrospective cross-sectional analysis encompassed 510 eyes from 255 consecutive healthy participants. Wide-field optical coherence tomography angiography (WF-OCTA) imaging was used to assess the presence of PVVs. Eyes were classified according to refractive status (emmetropia, low and moderate myopia, and high myopia) and age (minors and adults). The incidence and characteristics of eyes with PVVs were analyzed. Results Participants (mean age = 30.60 ± 21.12 years, 47.4% men) showed a mean refractive error of -2.83 ± 3.10 diopters (D; range = -12.00 to +0.75). PVVs were observed in 16.1% (82/510) of eyes. Of these, 39% (32/82) had PVVs in one eye and 61% (50/82) in both eyes. The mean number of PVVs per eye was 1.65 ± 1.05 (range = 1-6). PVVs are mainly around the optic disc (78%, 64/82) of eyes with PVVs and less in the macular area (6.1%, 5/82) or elsewhere (15.9%, 13/82). PVV incidence correlated with refractive status: 10.3% (22/213) in emmetropia, 16.6% (31/187) in low and moderate myopia, and 26.4% (29/110) in high myopia (P = 0.001), but not with age. Refractive status was the key predictor of PVV occurrence (odds ratio [OR] = 1.45, 95% confidence interval [CI] = 1.02-2.06, P = 0.038). Conclusions This study confirms PVVs' presence in healthy eyes, highlighting their inherent existence and susceptibility to alterations due to refractive conditions. These findings enhance our understanding of the vortex vein system and its distribution within the eyes.
Collapse
Affiliation(s)
- Guiqin He
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xiongze Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xuenan Zhuang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yunkao Zeng
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yuhong Gan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yongyue Su
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Miaoling Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yuying Ji
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Lan Mi
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xuelin Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Feng Wen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| |
Collapse
|
4
|
Funatsu R, Sonoda S, Terasaki H, Shiihara H, Hirokawa M, Yuanting J, Tanabe Y, Sakamoto T. Vortex Veins in Eyes With Pachychoroid Spectrum Disorders Evaluated by the Adjusted Reverse 3-Dimensional Projection Model. OPHTHALMOLOGY SCIENCE 2023; 3:100320. [PMID: 37274011 PMCID: PMC10238580 DOI: 10.1016/j.xops.2023.100320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 04/13/2023] [Accepted: 04/17/2023] [Indexed: 06/06/2023]
Abstract
Purpose To compare the distribution of vortex vein ampulla (VVA) between pachychoroid spectrum disorder (PSD) and controls. Design A single-center, case-control study. Participants This study included 75 PSD, 35 fellow, and 65 control eyes. Methods We quantified VVA distribution using a 3-dimensional reverse projection model corrected for image distortion. We investigated the distribution of major drainage veins (MDV), in which macular Haller's vessels directly influx. Main Outcome Measures The mean distances from the optic disc to VVAs and the mean angles between VVAs and the fovea-disc line. Results The PSD group had significantly fewer VVA in infranasal sector (PSD, fellow, control; 1.6 ± 0.6, 1.8 ± 0.6, 1.9 ± 0.6, respectively, P = 0.026). In supralateral sector, for PSD, fellows, and controls, the mean distances from the optic disc to VVAs were 14.1 ± 1.0 mm, 14.1 ± 1.1 mm, and 13.6 ± 1.4 mm, respectively, and were significantly farther in PSD than in controls (P = 0.023). The mean angles between VVAs and the fovea-disc line were 64.8 ± 5.9°, 66.4 ± 6.4°, and 61.7 ± 6.4°, respectively, and were significantly higher in PSD and fellows than in controls (P = 0.008). The mean distances from the optic disc to MDV in supratemporal sector were 14.1 ± 1.2 and 13.7 ± 1.2 in eyes whose Haller's vessels extended beyond the fovea-disc line (asymmetry), and those that did not, respectively, with the asymmetric eyes significantly farther (P = 0.016). Conclusions The VVA position in supralateral sector was farther and higher in PSD than in controls, suggesting that the distribution of VVA may be associated with the development of PSD. Financial Disclosures Proprietary or commercial disclosure may be found after the references.
Collapse
Affiliation(s)
- Ryoh Funatsu
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Shozo Sonoda
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Hiroto Terasaki
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Hideki Shiihara
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| | - Mariko Hirokawa
- System Development Department, Nikon Corporation, Yokohama, Japan
| | - Ji Yuanting
- System Development Department, Nikon Corporation, Yokohama, Japan
| | - Yasushi Tanabe
- System Development Department, Nikon Corporation, Yokohama, Japan
| | - Taiji Sakamoto
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan
| |
Collapse
|
5
|
Luo Z, Xu Y, Xu K, Fan M, Tsui CK, Lu X, Wu B, Zhao X, Tang X, Wu P, Cui K, Yu S, Liang X. Choroidal Vortex Vein Drainage System in Central Serous Chorioretinopathy Using Ultra-Widefield Optical Coherence Tomography Angiography. Transl Vis Sci Technol 2023; 12:17. [PMID: 37738055 PMCID: PMC10519436 DOI: 10.1167/tvst.12.9.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/28/2023] [Indexed: 09/23/2023] Open
Abstract
Purpose To evaluate differences in the choroidal vortex vein drainage system (VV) in eyes between patients with central serous chorioretinopathy (CSC) and unaffected individuals using ultra-widefield optical coherence tomography angiography (UWF-OCTA). Methods In this cross-sectional observational study, 40 eyes of patients with CSC and 28 eyes of healthy volunteers were included. The analysis involved the use of UWF-OCTA to analyze the proportion of the choroidal vortex vein drainage system (VV%), choroidal thickness, choroidal vascular volume (CVV), and choroidal vascularity index (CVI) of the VV in each drainage quadrant. The location relationship between the leakage points in fluorescein angiography and the VV was also explored. Results A within-group analysis of VV% showed a statistically significant difference in the CSC group (P < 0.001) but not in the control group (P = 0.270). Compared to healthy eyes, CSC eyes had a significantly larger CVV and higher CVI in all regions (all P < 0.05). The superotemporal (ST) drainage system had the largest CVV and thickest choroidal layer among the four drainage quadrants (all P < 0.05) in CSC eyes. The leakage rate in the ST quadrant was significantly higher than that in the inferotemporal quadrant (P < 0.001). Conclusions CSC eyes have an asymmetric vortex vein drainage system, with relative hyperperfusion in all VV. Further, the preferential drainage route of the submacular choroid may be the ST drainage system in CSC eyes. Translational Relevance Targeting the imbalanced drainage system could be a potential therapeutic approach for CSC.
Collapse
Affiliation(s)
- Zhonghua Luo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Yue Xu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Kun Xu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Matthew Fan
- Yale College, Yale University, New Haven, CT, USA
| | - Ching-Kit Tsui
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xi Lu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Benjuan Wu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xinyu Zhao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xiaoyu Tang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Peiqi Wu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Kaixuan Cui
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Shanshan Yu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xiaoling Liang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-Sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| |
Collapse
|
6
|
Zhang X, Lim CZF, Chhablani J, Wong YM. Central serous chorioretinopathy: updates in the pathogenesis, diagnosis and therapeutic strategies. EYE AND VISION (LONDON, ENGLAND) 2023; 10:33. [PMID: 37430344 DOI: 10.1186/s40662-023-00349-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 06/12/2023] [Indexed: 07/12/2023]
Abstract
Central serous chorioretinopathy (CSCR), first described by Albrecht von Graefe in 1866, is characterized by focal serous detachment of the neural retina and/or retinal pigment epithelium (RPE) in the posterior pole. CSCR is the first ever described pachychoroid disease. Most recently, hypothetical venous overload choroidopathy is also proposed due to its distinguished morphological and pathological characteristics, including choroidal thickening, choriocapillaris hyperpermeability, remodelling, and intervortex venous anastomoses. Identification of genetic variants is necessary to comprehend the pathophysiology of CSCR. The novel multimodality imaging platforms, including the ultra-widefield imaging system, flavoprotein fluorescence, fluorescence lifetime imaging ophthalmoscopy, and multispectral imaging system, have been used for diagnosing and managing CSCR. Half-dose photodynamic therapy (PDT) remains the mainstay of clinical practice, with about 95% of patients with chronic CSCR improving to visual acuity (VA) of 20/30 or better. The use of oral eplerenone for routine clinical care remains controversial, and long-term randomized clinical trials are warranted to investigate its efficacy in acute and chronic CSCR. While CSCR has generally been recognized as a self-limiting disease with good prognosis, the underlying pathogenesis is still not fully understood, and treatments are often not fully effective. With new evidence emerging about pachydrusen being a disease precursor in both CSCR and polypoidal choroidal vasculopathy (PCV), it would be interesting to investigate whether CSCR can be a precursor to PCV. In this review, we highlighted the currently available evidence on the pathogenesis, diagnosis, multimodality imaging features, and management strategies, including recent findings related to CSCR.
Collapse
Affiliation(s)
- Xinyuan Zhang
- Beijing Tongren Eye Center, Beijing Institute of Ophthalmology, Tongren Hospital, Capital Medical University, Beijing University of Medical Science, Beijing, 100730, People's Republic of China.
| | - Connie Zhi Fong Lim
- Beijing Tongren Eye Center, Beijing Institute of Ophthalmology, Tongren Hospital, Capital Medical University, Beijing University of Medical Science, Beijing, 100730, People's Republic of China
| | - Jay Chhablani
- UPMC Eye Center, University of Pittsburgh, Pittsburgh, USA
| | - Yew Meng Wong
- Southern Specialist Eye Center SDN, BHD, Malacca, Malaysia
| |
Collapse
|
7
|
Brinks J, van Dijk EHC, Meijer OC, Schlingemann RO, Boon CJF. Choroidal arteriovenous anastomoses: a hypothesis for the pathogenesis of central serous chorioretinopathy and other pachychoroid disease spectrum abnormalities. Acta Ophthalmol 2022; 100:946-959. [PMID: 35179828 PMCID: PMC9790326 DOI: 10.1111/aos.15112] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 12/30/2022]
Abstract
The pachychoroid disease spectrum (PDS) includes several chorioretinal diseases that share specific choroidal abnormalities. Although their pathophysiological basis is poorly understood, diseases that are part of the PDS have been hypothesized to be the result of venous congestion. Within the PDS, central serous chorioretinopathy is the most common condition associated with vision loss, due to an accumulation of subretinal fluid in the macula. Central serous chorioretinopathy is characterized by distinct risk factors, most notably a high prevalence in males and exposure to corticosteroids. Interestingly, sex differences and corticosteroids are also strongly associated with specific types of arteriovenous anastomoses in the human body, including dural arteriovenous fistula and surgically created arteriovenous shunts. In this manuscript, we assess the potential of such arteriovenous anastomoses in the choroid as a causal mechanism of the PDS. We propose how this may provide a novel unifying concept on the pathophysiological basis of the PDS, and present cases in which this mechanism may play a role.
Collapse
Affiliation(s)
- Joost Brinks
- Department of OphthalmologyLeiden University Medical CentreLeidenThe Netherlands
| | - Elon H. C. van Dijk
- Department of OphthalmologyLeiden University Medical CentreLeidenThe Netherlands
| | - Onno C. Meijer
- Department of Medicine, Division of Endocrinology and MetabolismLeiden University Medical CentreLeidenThe Netherlands
| | - Reinier O. Schlingemann
- Department of Ophthalmology, Amsterdam University Medical CentresUniversity of AmsterdamAmsterdamThe Netherlands,Department of OphthalmologyUniversity of Lausanne, Jules‐Gonin Eye Hospital, Fondation Asile des AveuglesLausanneSwitzerland
| | - Camiel J. F. Boon
- Department of OphthalmologyLeiden University Medical CentreLeidenThe Netherlands,Department of Ophthalmology, Amsterdam University Medical CentresUniversity of AmsterdamAmsterdamThe Netherlands
| |
Collapse
|
8
|
Bacci T, Oh DJ, Singer M, Sadda S, Freund KB. Ultra-Widefield Indocyanine Green Angiography Reveals Patterns of Choroidal Venous Insufficiency Influencing Pachychoroid Disease. Invest Ophthalmol Vis Sci 2022; 63:17. [PMID: 35019945 PMCID: PMC8762674 DOI: 10.1167/iovs.63.1.17] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Purpose To compare patterns of choroidal venous drainage in eyes with pachychoroid disease to those of healthy subjects using ultra-widefield indocyanine green angiography (UWF ICGA). Methods Patients with pachychoroid disease and healthy controls were recruited at two referral centers. UWF ICGA images were used to evaluate the proportion of the postequatorial fundus drained by major vortex vein systems in each quadrant and to study the incidence and topography of choroidal vascular hyperpermeability (CVH) and intervortex venous anastomoses. Widefield swept-source optical coherence tomography (SS-OCT) was used to evaluate choroidal thickness at the posterior pole in eyes with pachychoroid disease. Results Fifty-two pachychoroid eyes and 26 healthy eyes were evaluated. Eyes with pachychoroid disease showed a significant within-subject variance in the proportion of the postequatorial fundus drained by each vortex vein system (range, 4.1%–48.1%; P < 0.0001) that was not seen in controls (range, 17.3%–31.7%; P = 0.11). CVH was present in all pachychoroid disease eyes and three of 26 controls. Intervortex venous anastomoses were present in 46 of 52 pachychoroid disease eyes and nine of 26 control eyes. Vortex vein systems with large drainage areas showed greater density of CVH spots. SS-OCT demonstrated asymmetric choroidal drainage in the macula of 59% of pachychoroid eyes. CVH and intervortex venous anastomoses were more prominent in areas showing maximal choroidal thickness. Conclusions In eyes with pachychoroid disease, imbalanced choroidal venous drainage with congestion of specific vortex vein systems may contribute to a state of choroidal venous insufficiency characterized by regional choroidal thickening, CVH and remodeling of venous drainage routes.
Collapse
Affiliation(s)
- Tommaso Bacci
- Vitreous Retina Macula Consultants of New York, New York, New York, United States.,Department of Ophthalmology, New York University Grossman School of Medicine, New York, New York, United States.,Ophthalmology Unit, Department of Medicine, Surgery and Neuroscience, University of Siena, Siena University Hospital, Siena, Italy
| | - Daniel J Oh
- Vitreous Retina Macula Consultants of New York, New York, New York, United States.,Department of Ophthalmology, New York University Grossman School of Medicine, New York, New York, United States.,LuEsther T. Mertz Retina Research Laboratory, Manhattan Eye, Ear and Throat Hospital, New York, New York, United States.,Columbia University Irving Medical Center, Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, New York, United States
| | - Michael Singer
- Medical Center of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas, United States
| | - SriniVas Sadda
- Doheny Eye Institute, Los Angeles, California, United States.,Ophthalmology, David Geffen School of Medicine, Los Angeles, California, United States
| | - K Bailey Freund
- Vitreous Retina Macula Consultants of New York, New York, New York, United States.,Department of Ophthalmology, New York University Grossman School of Medicine, New York, New York, United States.,LuEsther T. Mertz Retina Research Laboratory, Manhattan Eye, Ear and Throat Hospital, New York, New York, United States.,Columbia University Irving Medical Center, Edward S. Harkness Eye Institute, New York-Presbyterian Hospital, New York, New York, United States
| |
Collapse
|
9
|
Verma A, Bacci T, Sarraf D, Freund KB, Sadda SR. Vortex Vein Imaging: What Can It Tell Us? Clin Ophthalmol 2021; 15:3321-3331. [PMID: 34408390 PMCID: PMC8364369 DOI: 10.2147/opth.s324245] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 07/23/2021] [Indexed: 11/23/2022] Open
Abstract
This review article summarizes the patho-anatomy of the vortex veins, the major drainage channels for the choroid, and describes the various pathways of diseases associated with vortex vein abnormalities. This report also details the technical advancements to image the vortex veins, such as ultra-widefield indocyanine green angiography, which are critical to elucidate the importance of the vortices in various retino-choroidal disorders. Future applications of these advanced imaging systems to better understand the role of the vortex veins in health and disease are also discussed.
Collapse
Affiliation(s)
- Aditya Verma
- Doheny Eye Institute, Los Angeles, CA, USA.,Department of Ophthalmology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Tommaso Bacci
- Vitreous Retina Macula Consultants of New York, New York, NY, USA.,Department of Ophthalmology, New York University Grossman School of Medicine, New York, NY, USA
| | - David Sarraf
- Stein Eye Institute, David Geffen School of Medicine at University of California, Los Angeles, CA, 90095, USA
| | - K Bailey Freund
- Vitreous Retina Macula Consultants of New York, New York, NY, USA.,Department of Ophthalmology, New York University Grossman School of Medicine, New York, NY, USA
| | - SriniVas R Sadda
- Doheny Eye Institute, Los Angeles, CA, USA.,Department of Ophthalmology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| |
Collapse
|
10
|
Ashraf M, Cavallerano JD, Sun JK, Silva PS, Aiello LP. Ultrawide Field Imaging in Diabetic Retinopathy: Exploring the Role of Quantitative Metrics. J Clin Med 2021; 10:jcm10153300. [PMID: 34362084 PMCID: PMC8347462 DOI: 10.3390/jcm10153300] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/15/2021] [Accepted: 07/22/2021] [Indexed: 11/25/2022] Open
Abstract
Ultrawide field imaging (UWF) has allowed the visualization of a significantly greater area of the retina than previous standard approaches. In diabetic retinopathy (DR), significantly more lesions are seen on UWF imaging compared to the seven-standard ETDRS fields. In addition, some eyes have lesions that are located predominantly in the peripheral retina that are associated with an increased risk of DR progression. The current DR severity scales are still largely based on clinically visible retinal microvascular lesions and do not incorporate retinal periphery, neuroretinal, or pathophysiologic changes. Thus, current scales are not well suited for documenting progression or regression in eyes with very early or advanced DR, nor in the setting of vascular endothelial growth factor inhibitors (antiVEGF). In addition, the categorical system is highly subjective, and grading is variable between different graders based on experience level and training background. Recently, there have been efforts to quantify DR lesions on UWF imaging in an attempt to generate objective metrics for classification, disease prognostication and prediction of treatment response. The purpose of this review is to examine current quantitative metrics derived from UWF fluorescein angiograms and UWF color imaging to determine their feasibility in any potential future DR classification.
Collapse
Affiliation(s)
- Mohamed Ashraf
- Beetham Eye Institute, Joslin Diabetes Center, Boston, MA 02215, USA; (J.D.C.); (J.K.S.); (P.S.S.); (L.P.A.)
- Ophthalmology Department, Alexandria Faculty of Medicine, Alexandria Governorate 21500, Egypt
- Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
- Correspondence: ; Tel.: +1-(617)-309-2554
| | - Jerry D. Cavallerano
- Beetham Eye Institute, Joslin Diabetes Center, Boston, MA 02215, USA; (J.D.C.); (J.K.S.); (P.S.S.); (L.P.A.)
- Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
| | - Jennifer K. Sun
- Beetham Eye Institute, Joslin Diabetes Center, Boston, MA 02215, USA; (J.D.C.); (J.K.S.); (P.S.S.); (L.P.A.)
- Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
| | - Paolo S. Silva
- Beetham Eye Institute, Joslin Diabetes Center, Boston, MA 02215, USA; (J.D.C.); (J.K.S.); (P.S.S.); (L.P.A.)
- Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
| | - Lloyd Paul Aiello
- Beetham Eye Institute, Joslin Diabetes Center, Boston, MA 02215, USA; (J.D.C.); (J.K.S.); (P.S.S.); (L.P.A.)
- Ophthalmology, Harvard Medical School, Boston, MA 02215, USA
| |
Collapse
|
11
|
Brinks J, van Dijk EHC, Klaassen I, Schlingemann RO, Kielbasa SM, Emri E, Quax PHA, Bergen AA, Meijer OC, Boon CJF. Exploring the choroidal vascular labyrinth and its molecular and structural roles in health and disease. Prog Retin Eye Res 2021; 87:100994. [PMID: 34280556 DOI: 10.1016/j.preteyeres.2021.100994] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 07/04/2021] [Accepted: 07/07/2021] [Indexed: 12/14/2022]
Abstract
The choroid is a key player in maintaining ocular homeostasis and plays a role in a variety of chorioretinal diseases, many of which are poorly understood. Recent advances in the field of single-cell RNA sequencing have yielded valuable insights into the properties of choroidal endothelial cells (CECs). Here, we review the role of the choroid in various physiological and pathophysiological mechanisms, focusing on the role of CECs. We also discuss new insights regarding the phenotypic properties of CECs, CEC subpopulations, and the value of measuring transcriptomics in primary CEC cultures derived from post-mortem eyes. In addition, we discuss key phenotypic, structural, and functional differences that distinguish CECs from other endothelial cells such as retinal vascular endothelial cells. Understanding the specific clinical and molecular properties of the choroid will shed new light on the pathogenesis of the broad clinical range of chorioretinal diseases such as age-related macular degeneration, central serous chorioretinopathy and other diseases within the pachychoroid spectrum, uveitis, and diabetic choroidopathy. Although our knowledge is still relatively limited with respect to the clinical features and molecular pathways that underlie these chorioretinal diseases, we summarise new approaches and discuss future directions for gaining new insights into these sight-threatening diseases and highlight new therapeutic strategies such as pluripotent stem cell‒based technologies and gene therapy.
Collapse
Affiliation(s)
- J Brinks
- Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands
| | - E H C van Dijk
- Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands
| | - I Klaassen
- Ocular Angiogenesis Group, Departments of Ophthalmology and Medical Biology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands
| | - R O Schlingemann
- Ocular Angiogenesis Group, Departments of Ophthalmology and Medical Biology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands; Department of Ophthalmology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands; Department of Ophthalmology, University of Lausanne, Jules Gonin Eye Hospital, Fondation Asile des Aveugles, Lausanne, Switzerland
| | - S M Kielbasa
- Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, the Netherlands
| | - E Emri
- Department of Clinical Genetics, Section of Ophthalmogenetics, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - P H A Quax
- Department of Vascular Surgery, Leiden University Medical Center, Leiden, the Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, the Netherlands
| | - A A Bergen
- Department of Clinical Genetics, Section of Ophthalmogenetics, Amsterdam University Medical Centers, Amsterdam, the Netherlands
| | - O C Meijer
- Department of Medicine, Division of Endocrinology and Metabolism, Leiden University Medical Center, Leiden, the Netherlands
| | - C J F Boon
- Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands; Department of Ophthalmology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, the Netherlands.
| |
Collapse
|
12
|
Kovacs KD, Young B, Adelman RA. Quantitative Modeling of Ultra-Widefield Choroidal Indocyanine Green Angiography in Systemic Vascular Diseases. Ophthalmic Surg Lasers Imaging Retina 2021; 52:281-287. [PMID: 34044717 DOI: 10.3928/23258160-20210429-06] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND AND OBJECTIVE To evaluate quantitative measurements of choroidal vasculature as obtained via ultra-widefield indocyanine green angiography (ICGA) in patients with systemic vascular diseases. PATIENTS AND METHODS Retrospective chart review and image analysis of 38 eyes from 21 patients with ICGA as part of routine retinal care. Images were binarized with lines drawn at specific antero-posterior landmarks. The vessel density and mean vessel caliber were measured along these lines and correlated with systemic vascular disease status. RESULTS Unlike those with other systemic vascular diseases, patients with obstructive sleep apnea (OSA) were found to have increased choroidal vascular density and vessel caliber in all measurements of the peripheral choroid compared with those patients without (P < .05 for all measurements). CONCLUSIONS Patients with OSA may have increased vascular density secondary to increased choroidal vessel caliber. Further work is needed to validate the modeling and confirm the association. [Ophthalmic Surg Lasers Imaging Retina. 2021;52:281-287.].
Collapse
|
13
|
Funatsu R, Terasaki H, Shiihara H, Kawano S, Hirokawa M, Tanabe Y, Fujiwara T, Mitamura Y, Sakamoto T, Sonoda S. Quantitative evaluations of vortex vein ampullae by adjusted 3D reverse projection model of ultra-widefield fundus images. Sci Rep 2021; 11:8916. [PMID: 33903616 PMCID: PMC8076294 DOI: 10.1038/s41598-021-88265-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 04/05/2021] [Indexed: 11/19/2022] Open
Abstract
The purpose of this study was to determine the number and location of vortex vein ampullae (VVA) in normal eyes. This was an observational retrospective study. Montage images of one on-axis and two off-axis ultra-widefield images of 74 healthy eyes were enhanced, and reverse projected onto a 3D model eye. The number and distance between the optic disc to each VVA in the four sectors were compared. The significance of correlations between these values and age, sex, visual acuity, refractive error, and axial length was determined. The mean number of VVA was 8.10/eye with 1.84, 2.12, 2.19 and 1.95 in upper lateral, lower lateral, upper nasal, and lower nasal sectors, respectively. The mean number of VVA/eye was significantly greater in men at 8.43 than women at 7.76 (P = 0.025). The mean distance between the optic disc and VVA was 14.15 mm, and it was 14.04, 15.55, 13.29 and 13.66 mm in the upper lateral, lower lateral, upper nasal and lower nasal sectors, respectively (all P < 0.05). The number and location of VVA can be obtained non-invasively, and the number was significantly higher in men than women. This technique can be used to determine whether these values are altered in a retinochoroidal disease.
Collapse
Affiliation(s)
- Ryoh Funatsu
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.,Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan
| | - Hiroto Terasaki
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.,Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan
| | - Hideki Shiihara
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.,Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan
| | - Sumihiro Kawano
- Department of Ophthalmology, Kurashiki Chuo Hospital, Kurashiki, Japan
| | | | | | | | - Yoshinori Mitamura
- Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan.,Department of Ophthalmology, Tokushima University Graduate School, Tokushima, Japan
| | - Taiji Sakamoto
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan. .,Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan.
| | - Shozo Sonoda
- Department of Ophthalmology, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.,Japan-Clinical Retina Study (J-CREST) Group, Kagoshima, Japan
| |
Collapse
|
14
|
Jung JJ, Yu DJG, Ito K, Rofagha S, Lee SS, Hoang QV. Quantitative Assessment of Asymmetric Choroidal Outflow in Pachychoroid Eyes on Ultra-Widefield Indocyanine Green Angiography. Invest Ophthalmol Vis Sci 2021; 61:50. [PMID: 32735325 PMCID: PMC7425745 DOI: 10.1167/iovs.61.8.50] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Purpose To quantitatively demonstrate asymmetric choroidal outflow in pachychoroid (central serous chorioretinopathy [CSC]/pachychoroid pigment epitheliopathy [PPE]) eyes using mid-phase, ultra-widefield indocyanine green angiography (UWF ICGA) images. Methods Eyes with a clinical diagnosis of CSC/PPE were imaged with multimodal imaging including UWF ICGA (Optos California). Quadrant brightness was measured by manually segmenting based on vortex vein location, calculating the brightness “max-min” value to assess nonuniformity between quadrants, and comparing between CSC/PPE and control eyes. A multivariate linear regression was performed to determine, across individual eyes, which specific quadrants have the greatest brightness in pachychoroid eyes, after taking into account patient-eye-specific variability. Results Thirty-three eyes (18 patients) with CSC/PPE along with 16 eyes of 9 controls had a mean age of 51.94 ± 9.72 vs. 53.78 ± 17.92 years (P = 0.731), respectively. Max-min analysis showed significantly increased likelihood of nonuniform drainage between vortex veins in both CSC/PPE and control eyes. Multivariate linear regression in control eyes showed that on average, the inferotemporal quadrant was significantly brighter than the superonasal quadrant (9.72 units, P < 0.001). Among CSC/PPE eyes, adjusting for the preferential, nonuniform drainage in control eyes, the inferonasal and inferotemporal quadrants in CSC/PPE eyes remained significantly brighter than the reference quadrant by 5.36 units (P = 0.034) and 7.51 units (P = 0.008), respectively. Conclusions Asymmetric choroidal venous outflow occurs in both control and CSC/PPE eyes based on UWF ICGA quantitative brightness levels in each quadrant. Increased brightness levels along inferior quadrants in mid-phase ICGA images suggest venous outflow congestion among eyes with CSC or PPE.
Collapse
|
15
|
Verma A, Maram J, Alagorie AR, van Hemert J, Bell DJ, Singer M, Keane D, Carnevale J, Nittala M, Sadda S. Peripheral extent of the choroidal circulation by ultra-widefield indocyanine green angiography in healthy eyes. Br J Ophthalmol 2020; 105:824-828. [PMID: 32829300 DOI: 10.1136/bjophthalmol-2020-316412] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/29/2020] [Indexed: 11/04/2022]
Abstract
AIM To analyse the peripheral extent of choroidal circulation using ultra-widefield (UWF) indocyanine green angiography (ICGA) in healthy eyes. METHODS UWF ICGA images of 55 eyes of 36 healthy subjects were captured using the Optos California (Optos, Dunfermline, United Kingdom) in this prospective observational study. Images were analysed to locate the peripheral extent of the visible choroidal circulation, and the boundary was marked in ImageJ (v1.52). Each pixel annotated as the border of the choroidal circulation was projected individually to its anatomically correct location on the three-dimensional model eye, and spherical trigonometry was applied (using the Optos software) to calculate its respective radial distance from the centre of the optic disc in metric units (corrected by stereographic projection) for each quadrant. RESULTS The mean area of the peripheral extent was estimated to be 893.2 mm2 (95% CI: 844.2 to 942.3 mm2). The mean distance (range) of this boundary from optic nerve centre was 18.22 mm (95% CI: 14.0 to 23.14 mm). Multiple regression analysis with age, gender, axial length or ethnicity showed no relationship. There was excellent inter-grader reproducibility, with intraclass correlation coefficients of 0.95 (95% CI: 0.80 to 0.99, p<0.001) for distance and 0.99 (95% CI: 0.988 to 0.999, p<0.001) for area measurements. CONCLUSIONS The peripheral choroidal boundary may be defined using UWF ICGA. Knowledge of the normal extent and its variability is essential to understand the impact of disease on the choroidal vasculature.
Collapse
Affiliation(s)
- Aditya Verma
- Doheny Eye Institute, Los Angeles, California, USA.,Ophthalmology, David Geffen School of Medicine, Los Angeles, California, USA
| | | | - Ahmed Roshdy Alagorie
- Doheny Eye Institute, Los Angeles, California, USA.,Ophthalmology, David Geffen School of Medicine, Los Angeles, California, USA.,Department of Ophthalmology, Faculty of Medicine, Tanta University, Tanta, Egypt
| | | | - Darren J Bell
- Medical Center Ophthalmology Associates, San Antonio, Texas, USA
| | - Michael Singer
- Ophthalmology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
| | | | | | | | - SriniVas Sadda
- Doheny Eye Institute, Los Angeles, California, USA .,Ophthalmology, David Geffen School of Medicine, Los Angeles, California, USA
| |
Collapse
|