1. Articles from Stefan Sacu

    1-24 of 31 1 2 »
    1. Impact of large choroidal vessels on choriocapillaris flow deficit analyses in optical coherence tomography angiography

      Impact of large choroidal vessels on choriocapillaris flow deficit analyses in optical coherence tomography angiography

      Purpose To investigate the impact of large choroidal vessels (LCV) on Choriocapillaris (CC) flow deficit (FD) analyses with swept-source optical coherence tomography angiography (SS-OCTA) Design Prospective, cross-sectional study. Methods Macular 6x6mm SS-OCTA scans were obtained from intermediate age-related macular degeneration (iAMD) and healthy eyes. Images were captured and processed according to most common standards and analyzed for percentage of flow-deficits (FD%) within four 1x1mm squares at the corners of each image. Choroidal thickness (CT), iris color and refraction error were considered as potential influential factors for LCV visibility. A linear mixed model and logistic regression models were calculated for statistical ...

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    2. Three-dimensional composition of the photoreceptor cone layers in healthy eyes using adaptive-optics optical coherence tomography (AO-OCT)

      Three-dimensional composition of the photoreceptor cone layers in healthy eyes using adaptive-optics optical coherence tomography (AO-OCT)

      Purpose To assess the signal composition of cone photoreceptors three-dimensionally in healthy retinas using adaptive optics optical coherence tomography (AO-OCT). Methods Study population. Twenty healthy eyes of ten subjects (age 23 to 67). Procedures. After routine ophthalmological assessments, eyes were examined using AO-OCT. Three-dimensional volumes were acquired at 2.5° and 6.5° foveal eccentricity in four main meridians (superior, nasal, inferior, temporal). Cone densities and signal compositions were investigated in four different planes: the cone inner segment outer segment junction (IS/OS), the cone outer segment combined with the IS/OS (ISOS+), the cone outer segment tips (COST) and ...

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    3. Intraretinal microvascular changes after ERM and ILM peeling using SSOCTA

      Intraretinal microvascular changes after ERM and ILM peeling using SSOCTA

      Background To prospectively investigate retinal vascular changes in patients undergoing epiretinal membrane (ERM) and internal limiting membrane (ILM) peeling using swept source optical coherence tomography angiography (SSOCTA). Methods Consecutive patients were grouped based on ERM severity and followed using SSOCTA up to month 3 after surgical intervention. Superficial and deep foveal avascular zone (s/dFAZ) as well as foveal and parafoveal vessel density (VD) were correlated with ERM severity and visual acuity. Differences between groups were evaluated. Results Significant correlations were found between ERM severity and baseline sFAZ, dFAZ and best corrected visual acuity (BCVA), central retinal subfield thickness (CST ...

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    4. SWEPT SOURCE OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY, FLUORESCEIN ANGIOGRAPHY, AND INDOCYANINE GREEN ANGIOGRAPHY COMPARISONS REVISITED: Using a Novel Deep-Learning-Assisted Approach for Image Registration

      SWEPT SOURCE OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY, FLUORESCEIN ANGIOGRAPHY, AND INDOCYANINE GREEN ANGIOGRAPHY COMPARISONS REVISITED: Using a Novel Deep-Learning-Assisted Approach for Image Registration

      Purpose: To compare area measurements between swept source optical coherence tomography angiography ( SSOCTA ), fluorescein angiography ( FA ), and indocyanine green angiography ( ICGA ) after applying a novel deep-learning-assisted algorithm for accurate image registration. Methods: We applied an algorithm for the segmentation of blood vessels in FA , ICGA , and SSOCTA images of 24 eyes with treatment-naive neovascular age-related macular degeneration. We trained a model based on U-Net and Mask R-CNN for each imaging modality using vessel annotations and junctions to estimate scaling, translation, and rotation. For fine-tuning of the registration, vessels and the elastix framework were used. Area, perimeter, and circularity measurements were ...

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    5. Retinal vessel architecture in retinopathy of prematurity and healthy controls using swept‐source optical coherence tomography angiography

      Retinal vessel architecture in retinopathy of prematurity and healthy controls using swept‐source optical coherence tomography angiography

      Purpose To determine microvascular changes in children with a history of retinopathy of prematurity (ROP) and in a control group of full‐term children. Methods In a cross‐sectional study, 30 eyes of 15 children aged 6–8 years with a history of ROP were evaluated with swept‐source optical coherence tomography angiography (SS‐OCTA). Twenty‐eight eyes of 22 age‐matched full‐term children served as a healthy control group. The foveal avascular zone (FAZ), vessel density (VD) and choroidal vascular flow area (VFA) were evaluated on OCTA and correlated with central retinal thickness (CRT), visual acuity (VA), birth ...

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    6. Subretinal Drusenoid Deposits and Photoreceptor Loss Detecting Global and Local Progression of Geographic Atrophy by SD-OCT Imaging

      Subretinal Drusenoid Deposits and Photoreceptor Loss Detecting Global and Local Progression of Geographic Atrophy by SD-OCT Imaging

      Purpose : To investigate the impact of subretinal drusenoid deposits (SDD) and photoreceptor integrity on global and local geographic atrophy (GA) progression. Methods : Eighty-three eyes of 49 patients, aged 50 years and older with GA secondary to age-related macular degeneration (AMD), were prospectively included in this study. Participants underwent spectral-domain optical coherence tomography (SD-OCT) and fundus autofluorescence (FAF) imaging at baseline and after 12 months. The junctional zone and presence of SDD were delineated on SD-OCT and FAF images. Linear mixed models were calculated to investigate the association between GA progression and the junctional zone area, baseline GA area, age, global ...

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    7. SWEPT SOURCE OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY, FLUORESCEIN ANGIOGRAPHY, AND INDOCYANINE GREEN ANGIOGRAPHY COMPARISONS REVISITED

      SWEPT SOURCE OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY, FLUORESCEIN ANGIOGRAPHY, AND INDOCYANINE GREEN ANGIOGRAPHY COMPARISONS REVISITED

      Purpose: To compare area measurements between swept source optical coherence tomography angiography ( SSOCTA ), fluorescein angiography ( FA ), and indocyanine green angiography ( ICGA ) after applying a novel deep-learning-assisted algorithm for accurate image registration. Methods: We applied an algorithm for the segmentation of blood vessels in FA , ICGA , and SSOCTA images of 24 eyes with treatment-naive neovascular age-related macular degeneration. We trained a model based on U-Net and Mask R-CNN for each imaging modality using vessel annotations and junctions to estimate scaling, translation, and rotation. For fine-tuning of the registration, vessels and the elastix framework were used. Area, perimeter, and circularity measurements were ...

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    8. Semi‐automated quantification of geographic atrophy with blue‐light autofluorescence and spectral‐domain optical coherence tomography: a comparison between the region finder and the advanced retinal pigment epithelium tool in the clinical setting

      Semi‐automated quantification of geographic atrophy with blue‐light autofluorescence and spectral‐domain optical coherence tomography: a comparison between the region finder and the advanced retinal pigment epithelium tool in the clinical setting

      Purpose To compare inter‐ and intraobserver reliability and intermodality agreement on quantification of geographic atrophy, using two routinely available quantification tools, based on blue‐light fundus autofluorescence (BAF) and spectral‐domain optical coherence tomography (SD‐OCT). Methods Quantifications of atrophic lesions within the central 5 mm of 30 eyes from 30 patients (mean age: 76.1 years) were independently performed by two clinicians on BAF images using the region finder (RF; Heidelberg Engineering) and on SD‐OCT using the advanced retinal pigment epithelium tool (ARPET; Carl Zeiss Meditec) at baseline and follow‐up (mean interval: 336 days). Inter‐ and intraobserver ...

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    9. Correlation between morphological characteristics in spectral‐domain‐optical coherence tomography, different functional tests and a patient's subjective handicap in acute central serous chorioretinopathy

      Correlation between morphological characteristics in spectral‐domain‐optical coherence tomography, different functional tests and a patient's subjective handicap in acute central serous chorioretinopathy

      Purpose The purpose of this study was to identify quantitatively measurable morphologic optical coherence tomography (OCT) characteristics in patients with an acute episode of central serous chorioretinopathy (CSC) and evaluate their correlation to functional and psychological variables for their use in daily clinical practice. Methods Retinal thickness (RT), the height, area and volume of subretinal fluid (SRF)/pigment epithelium detachments were evaluated using the standardized procedures of the Vienna Reading Center. These morphologic characteristics were compared with functional variables [best‐corrected visual acuity (BCVA), contrast sensitivity (CS), retinal sensitivity/microperimetry, fixation stability], and patients’ subjective handicap from CSC using the ...

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    10. Comparison of SD-Optical Coherence Tomography Angiography and Indocyanine Green Angiography in Type 1 and 2 Neovascular Age-related Macular Degeneration

      Comparison of SD-Optical Coherence Tomography Angiography and Indocyanine Green Angiography in Type 1 and 2 Neovascular Age-related Macular Degeneration

      Purpose : The purpose of this study is to compare the ability of spectral domain optical coherence tomography angiography (SD-OCTA) and indocyanine green angiography (ICGA) to detect and measure lesion area in patients with type 1 and 2 choroidal neovascularization (CNV). Methods : Types 1 and 2 neovascular AMD (nAMD) were included in this prospective and observational case series. ETDRS best-corrected visual acuity (BCVA), ophthalmic examination with funduscopy, OCTA (AngioVue), fluorescein angiography (FA), ICGA, and OCT (Spectralis) were performed. CNV measurements were done manually by two experienced graders using the systems' innate region selection tools. Results : Forty eyes of 39 consecutive patients ...

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    11. Correlation between morphological characteristics in spectral-domain-optical coherence tomography, different functional tests and a patient's subjective handicap in acute central serous chorioretinopathy

      Correlation between morphological characteristics in spectral-domain-optical coherence tomography, different functional tests and a patient's subjective handicap in acute central serous chorioretinopathy

      Purpose The purpose of this study was to identify quantitatively measurable morphologic optical coherence tomography (OCT) characteristics in patients with an acute episode of central serous chorioretinopathy (CSC) and evaluate their correlation to functional and psychological variables for their use in daily clinical practice. Methods Retinal thickness (RT), the height, area and volume of subretinal fluid (SRF)/pigment epithelium detachments were evaluated using the standardized procedures of the Vienna Reading Center. These morphologic characteristics were compared with functional variables [best-corrected visual acuity (BCVA), contrast sensitivity (CS), retinal sensitivity/microperimetry, fixation stability], and patients’ subjective handicap from CSC using the National ...

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    12. Monitoring retinoschisis and non-acute retinal detachment by optical coherence tomography: morphologic aspects and clinical impact

      Monitoring retinoschisis and non-acute retinal detachment by optical coherence tomography: morphologic aspects and clinical impact

      Purpose To differentiate retinoschisis (RS) from non-acute retinal detachment (naRD) in clinical routine using optical coherence tomography (OCT), describe unique morphological OCT characteristics and monitor disease progression. Methods This prospective, observational study included 64 eyes of 44 patients with either RS or naRD. Patients were examined clinically and using Heidelberg Spectralis OCT ® , Topcon DRI OCT ® and Cirrus HRA-OCT ® over 2 years with follow-up at 1, 3, 6, 12 and 24 months. Main outcomes were typical morphologic findings of RS and naRD described in OCT. Progression was monitored using Spectralis OCT ® follow-up mapping and an eye-tracking method. Results Forty-seven eyes were ...

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    13. Identification and clinical role of choroidal neovascularization characteristics based on optical coherence tomography angiography

      Identification and clinical role of choroidal neovascularization characteristics based on optical coherence tomography angiography

      Purpose To suggest a novel classification of neovascular age-related macular degeneration (AMD) based on optical coherence tomography angiography (OCTA) and to correlate morphological characteristics based on optical coherence tomography (OCT)/OCTA with clinical criteria of disease activity. Methods A total of 88 eyes with neovascular AMD (14 treatment-naïve, 74 eyes following anti-vascular endothelial growth factor treatment (VEGF)) were examined using the AngioVue OCTA system (Optovue, Inc., Fremont, CA, USA) and evaluated based on vascular morphology. Choroidal neovascularization (CNV)-vessel morphology based on OCTA and associations with retinal layers were described and correlated with clinical markers of disease activity. Results ...

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    14. Automated Identification and Quantification of Subretinal Fibrosis in Neovascular Age-Related Macular Degeneration Using Polarization-Sensitive OCT

      Automated Identification and Quantification of Subretinal Fibrosis in Neovascular Age-Related Macular Degeneration Using Polarization-Sensitive OCT

      Purpose : To identify and quantify subretinal fibrosis in eyes with advanced neovascular age-related macular degeneration (nAMD) using polarization-sensitive optical coherence tomography (PS-OCT). Methods : Eyes of patients with subretinal fibrosis secondary to nAMD were included in this case series. All patients underwent a complete ophthalmic examination to clearly identify advanced nAMD lesions with fibrosis. Examinations of PS-OCT were performed using a novel system with an integrated eye tracker. Areas of fibrosis in PS-OCT, automatically segmented using a custom-built algorithm, were compared with conventional imaging modalities including spectral-domain OCT, fluorescein angiography, and color fundus photography in their potential to visualize fibrosis in ...

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    15. Retinal Pigment Epithelial Features in Central Serous Chorioretinopathy Identified by Polarization-Sensitive Optical Coherence Tomography

      Retinal Pigment Epithelial Features in Central Serous Chorioretinopathy Identified by Polarization-Sensitive Optical Coherence Tomography

      Purpose : To determine the subclinical RPE lesions detected by tissue selective polarization-sensitive optical coherence tomography (PS-OCT) in eyes with central serous chorioretinopathy (CSC) and to compare PS-OCT findings to current imaging standards. Methods : In this prospective observational case series, individuals with unilateral or bilateral active CSC were imaged using PS-OCT at baseline and after resolution of serous retinal detachment. Features seen on PS-OCT were compared with corresponding lesions as seen on conventional, intensity-based spectral-domain OCT (SD-OCT), fluorescein angiography, and indocyanine green angiography (ICGA). Features of RPE evaluated by PS-OCT were as follows: area and volume of pigment epithelium detachment (PED ...

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    16. Polarization-Sensitive Optical Coherence Tomography and Conventional Retinal Imaging Strategies in Assessing Foveal Integrity in Geographic Atrophy

      Polarization-Sensitive Optical Coherence Tomography and Conventional Retinal Imaging Strategies in Assessing Foveal Integrity in Geographic Atrophy

      Purpose : To compare current imaging methods with respect to their ability to detect the condition of the fovea in patients with geographic atrophy (GA). Methods : The retinas of 176 eyes with GA were imaged using two spectral-domain optical coherence tomography (SD-OCT) systems, Cirrus HD-OCT and Spectralis HRA+OCT, and fundus autofluorescence (FAF) and infrared imaging (IR) was used in the scanning laser ophthalmoscope (SLO) mode. Polarization-sensitive OCT (PS-OCT), which selectively visualizes the RPE in addition to SD-OCT features, was used to image 95 eyes. Geographic atrophy lesions were categorized as fovea spared, involved, or not quantifiable (grades 0, 1, and ...

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    17. Identification of Drusen Characteristics in Age-related Macular Degeneration by Polarization-Sensitive Optical Coherence Tomography

      Identification of Drusen Characteristics in Age-related Macular Degeneration by Polarization-Sensitive Optical Coherence Tomography

      Purpose To describe qualitative characteristics of drusen in eyes with non-advanced age-related macular degeneration (AMD) using polarization-sensitive optical coherence tomography (OCT). Design Cross-sectional study Methods 25 eyes of 25 patients with early to intermediate (non-advanced) AMD were imaged with polarization-sensitive OCT using macular volume scans. All individual drusen in each B-scan were manually delineated by experts certified by a reading center and graded for six different morphological characteristics based on a defined classification scheme, including the presence of internal depolarizing structures and associated depolarizing foci. With the use of a custom-made software, the central B-scan of each individual druse was ...

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    18. Detection and Differentiation of Intraretinal Hemorrhage in Spectral Domain Optical Coherence Tomography

      Detection and Differentiation of Intraretinal Hemorrhage in Spectral Domain Optical Coherence Tomography

      Purpose : The purpose of this study was to classify and detect intraretinal hemorrhage (IRH) in spectral domain optical coherence tomography (SD-OCT). Methods : Initially the presentation of IRH in BRVO-patients in SD-OCT was described by one reader comparing color-fundus (CF) and SD-OCT using dedicated software. Based on these established characteristics, the presence and the severity of IRH in SD-OCT and CF were assessed by two other masked readers and the inter-device and the inter-observer agreement were evaluated. Further the area of IRH was compared. Results : About 895 single B-scans of 24 eyes were analyzed. About 61% of SD-OCT scans and 46 ...

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    19. DIFFERENTIAL DIAGNOSIS OF MACULAR EDEMA OF DIFFERENT PATHOPHYSIOLOGIC ORIGINS BY SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY

      DIFFERENTIAL DIAGNOSIS OF MACULAR EDEMA OF DIFFERENT PATHOPHYSIOLOGIC ORIGINS BY SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY

      Purpose: To develop a classification approach based solely on spectral domain optical coherence tomography to differentiate macular edema (ME) of different disease entities and to determine underlying pathology. Methods: A cross-sectional study including 153 participants: 27 with Irvine-Gass, 31 with uveitic ME, 24 with ME after branch retinal vein occlusion, 13 with central retinal vein occlusion, 44 with diabetic ME, and 14 controls. Spectral domain optical coherence tomography was graded according to a standardized reading protocol. Grading characteristics were: ME pattern in the central line (horizontal/vertical) and in volume scans, distribution of cysts in Early Treatment Diabetic Retinopathy Study ...

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    20. A Longitudinal Comparison of Spectral-Domain Optical Coherence Tomography and Fundus Autofluorescence in Geographic Atrophy

      A Longitudinal Comparison of Spectral-Domain Optical Coherence Tomography and Fundus Autofluorescence in Geographic Atrophy

      Purpose To identify reliable criteria based on spectral-domain optical coherence tomography (SD-OCT) to monitor disease progression in geographic atrophy due to age-related macular degeneration (AMD) compared with lesion size determination based on fundus autofluorescence (FAF). Design Prospective longitudinal observational study Methods Setting :Institutional. Study population A total of 48 eyes in 24 patients with geographic atrophy. Observation Procedures Eyes with geographic atrophy were included and examined at baseline and months 3, 6, 9 and 12. At each study visit best-corrected visual acuity (BCVA), FAF and SD-OCT imaging using a Spectralis HRA + OCT System were performed. FAF images were analyzed using ...

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    21. Characterization of Stargardt disease using polarisation-sensitive optical coherence tomography and fundus autofluorescence imaging

      Characterization of Stargardt disease using polarisation-sensitive optical coherence tomography and fundus autofluorescence imaging

      Purpose: To identify disease-specific changes in Stargardt disease (STGD) based on imaging with polarisation-sensitive spectral-domain optical coherence tomography (PS-OCT) and to compare structural changes to those visible on blue light fundus autofluorescence (FAF)imaging. Methods: 28 eyes of 14 patients diagnosed with STGD were imaged using a novel high-speed, large-field PS-OCT system and FAF (Heidelberg Retina Angiograph/Spectralis, Heidelberg Engineering, Germany; excitation 488nm, emission >500nm). The ophthalmoscopic phenotype was classified into 3 groups as suggested by Fishman et al. ABCA4 mutation testing detected 15 STGD alleles, 6 of which harbour novel mutations. Results: STGD phenotype 1 (12 eyes) showed sharply ...

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    22. Correlation of SD-OCT Features and Retinal Sensitivity in Neovascular Age-related Macular Degeneration

      Correlation of SD-OCT Features and Retinal Sensitivity in Neovascular Age-related Macular Degeneration

      Purpose: To correlate retinal sensitivity in patients with neovascular age-related macular degeneration (AMD) with specific characteristics of retinal morphology. Methods: Thirty eyes of 30 patients presenting with active choroidal neovascularization were examined by spectral domain optical coherence tomography (SD-OCT) and microperimetry (MP1). Image processing software was used to match a fundus photographic (FP) MP1 image with an infrared+OCT SD-OCT image. Each MP test point for retinal sensitivity was positioned at the corresponding SD-OCT location, and the microperimetric results were evaluated. Results: An intact retinal configuration was associated with a median retinal sensitivity of 15.5 dB [quartiles: 12dB, 18dB ...

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    23. Morphologic Characteristics of Idiopathic Juxtafoveal Telangiectasia Using Spectral-Domain and Polarization-Sensitive Optical Coherence Tomography

      Morphologic Characteristics of Idiopathic Juxtafoveal Telangiectasia Using Spectral-Domain and Polarization-Sensitive Optical Coherence Tomography
      Purpose: Idiopathic juxtafoveal telangiectasia (IJT) is characteristically associated with pigmentary changes. Polarization-sensitive spectral-domain optical coherence tomography (PS-SD-OCT) enables imaging of the retinal pigment epithelium (RPE) and similar melanin-containing structures based on specific polarization properties. This study examined IJT with the latest-generation SD-OCT and PS-SD-OCT, identifying pathophysiologically relevant characteristics of the retinal layers and RPE. Methods: Twenty-two eyes of 12 patients with IJT were examined by PS-SD-OCT, with special focus on RPE detection and segmentation. Furthermore, SD-OCT technology (Cirrus, Spectralis, and 3D-OCT-1000) was applied. Characteristics of the retinal layers and RPE were evaluated. A classification system based on OCT characteristics of ...
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    24. Diagnostic Evaluation of Type 2 (Classic) Choroidal Neovascularization: Optical Coherence Tomography, Indocyanine Green Angiography, and Fluorescein Angiography

      Diagnostic Evaluation of Type 2 (Classic) Choroidal Neovascularization: Optical Coherence Tomography, Indocyanine Green Angiography, and Fluorescein Angiography
      Purpose: To evaluate the diagnostic characteristics of type 2 (classic) choroidal neovascularizations secondary to age-related macular degeneration using spectral domain-optical coherence tomography (SD OCT), indocyanine green angiography (ICGA), and fluorescein angiography (FA).Design: Observational case series.Methods: setting: Institutional. study population: Thirteen treatment-naïve eyes with type 2 choroidal neovascularization without an occult component. main outcome measures: Greatest horizontal dimension, based on the anatomic features of the neovascular complex by SD OCT (Spectralis; Heidelberg Engineering), ICGA, and FA; retinal leakage area in late-phase FA and ICGA; and the area of retinal edema in SD OCT. observation procedures: For direct comparison, ICGA ...
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    1-24 of 31 1 2 »
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