1. Articles from joan w. miller

    1-24 of 24
    1. Nonperfusion Area and Other Vascular Metrics by Wider Field Swept-Source OCT Angiography as Biomarkers of Diabetic Retinopathy Severity

      Nonperfusion Area and Other Vascular Metrics by Wider Field Swept-Source OCT Angiography as Biomarkers of Diabetic Retinopathy Severity

      Purpose: To study the wider field swept-source optical coherence tomography angiography (WF SS-OCTA) metrics, especially non-perfusion area (NPA), in the diagnosing and staging of DR. Design: Cross-sectional observational study (November 2018-September 2020). Participants: 473 eyes of 286 patients (69 eyes of 49 control patients and 404 eyes of 237 diabetic patients). Methods: We imaged using 6mm×6mm and 12mm×12mm angiograms on WF SS-OCTA. Images were analyzed using the ARI Network and FIJI ImageJ. Mixed effects multiple regression models and receiver operator characteristic analysis was used for statistical analyses. Main outcome measures: Quantitative metrics such as vessel density (VD); vessel ...

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    2. Wide-field swept-source optical coherence tomography angiography in the assessment of retinal microvasculature and choroidal thickness in patients with myopia

      Wide-field swept-source optical coherence tomography angiography in the assessment of retinal microvasculature and choroidal thickness in patients with myopia

      Background/aims: Pathological myopia (PM) is a leading cause of blindness worldwide. We aimed to evaluate microvascular and chorioretinal changes in different stages of myopia with wide-field (WF) swept-source (SS) optical coherence tomography angiography (OCTA). Methods: This prospective cross-sectional observational study included 186 eyes of 122 patients who had undergone imaging between November 2018 and October 2020. Vessel density (VD) and vessel skeletonised density (VSD) of superficial capillary plexus, deep capillary plexus and whole retina, as well as foveal avascular zone parameters, retinal thickness (RT) and choroidal thickness (CT), were calculated. Results: This study evaluated 75 eyes of 48 patients ...

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    3. Widefield Swept-source OCT Angiography Metrics Associated with the Development of Diabetic Vitreous Hemorrhage A Prospective Study

      Widefield Swept-source OCT Angiography Metrics Associated with the Development of Diabetic Vitreous Hemorrhage A Prospective Study

      Objective: To investigate the association among widefield swept-source optical coherence tomography angiography (WF SS-OCTA) metrics and systemic parameters and the occurrence of vitreous hemorrhage (VH) in eyes with proliferative diabetic retinopathy (PDR). Design: Prospective, observational study. Participants: Fifty-five eyes from 45 adults with PDR, with no history of VH, followed for at least 3 months. Methods: All patients were imaged with WF SS-OCTA (Montage 15×15mm and HD-51 Line scan). Images were independently evaluated by two graders for quantitative and qualitative WF SS-OCTA metrics defined a priori. Systemic and ocular parameters and WF SS-OCTA metrics were screened using Least Absolute ...

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    4. Retinal applications of swept source optical coherence tomography (OCT) and optical coherence tomography angiography (OCTA)

      Retinal applications of swept source optical coherence tomography (OCT) and optical coherence tomography angiography (OCTA)

      The advent of optical coherence tomography (OCT) revolutionized both clinical assessment and research of vitreoretinal conditions. Since then, extraordinary advances have been made in this imaging technology, including the relatively recent development of swept-source OCT (SS-OCT). SS-OCT enables a fast scan rate and utilizes a tunable swept laser at longer wavelengths than conventional spectral-domain devices. These features enable imaging of larger areas with reduced motion artifact, and a better visualization of the choroidal vasculature, respectively. Building on the principles of OCT, swept-source OCT has also been applied to OCT angiography (SS-OCTA), thus enabling a non-invasive in depth-resolved imaging of the ...

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    5. Detection of neovascularisation in the vitreoretinal interface slab using widefield swept-source optical coherence tomography angiography in diabetic retinopathy

      Detection of neovascularisation in the vitreoretinal interface slab using widefield swept-source optical coherence tomography angiography in diabetic retinopathy

      Aims To compare the efficacy of diabetic retinal neovascularisation (NV) detection using the widefield swept-source optical coherence tomography angiography (WF SS-OCTA) vitreoretinal interface (VRI) Angio slab and SS-OCT VRI Structure slab. Methods A prospective, observational study was performed at Massachusetts Eye and Ear from January 2019 to June 2020. Patients with proliferative diabetic retinopathy (PDR), patients with non-proliferative diabetic retinopathy and patients with diabetes but without diabetic retinopathy were included. All patients were imaged with WF SS-OCTA using the 12×12 mm Angio scan protocol centred on the fovea and optic disc. The en-face SS-OCTA VRI Angio slab and SS-OCT ...

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    6. A quantitative comparison of four optical coherence tomography angiography devices in healthy eyes

      A quantitative comparison of four optical coherence tomography angiography devices in healthy eyes

      Purpose Optical coherence tomography angiography (OCT-A) is a novel imaging modality for the diagnosis of chorioretinal diseases. A number of FDA-approved OCT-A devices are currently commercially available, each with unique algorithms and scanning protocols. Although several published studies have compared different combinations of OCT-A machines, there is a lack of agreement on the consistency of measurements across OCT-A devices. Therefore, we conducted a prospective quantitative comparison of four available OCT-A platforms. Methods Subjects were scanned on four devices: Optovue RTVue-XR, Heidelberg Spectralis OCT2 module, Zeiss Plex Elite 9000 Swept-Source OCT, and Topcon DRI-OCT Triton Swept-Source OCT. 3 mm × 3 mm ...

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    7. Comparison of widefield swept-source optical coherence tomography angiography with ultra-widefield colour fundus photography and fluorescein angiography for detection of lesions in diabetic retinopathy

      Comparison of widefield swept-source optical coherence tomography angiography with ultra-widefield colour fundus photography and fluorescein angiography for detection of lesions in diabetic retinopathy

      Aims To compare widefield swept-source optical coherence tomography angiography (WF SS-OCTA) with ultra-widefield colour fundus photography (UWF CFP) and fluorescein angiography (UWF FA) for detecting diabetic retinopathy (DR) lesions. Methods This prospective, observational study was conducted at Massachusetts Eye and Ear from December 2018 to October 2019. Proliferative DR, non-proliferative DR and diabetic patients with no DR were included. All patients were imaged with a WF SS-OCTA using a Montage 15×15 mm scan. UWF CFP and UWF FA were taken by a 200°, single capture retinal imaging system. Images were independently evaluated for the presence or absence of DR ...

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    8. Subthreshold Exudative Choroidal Neovascularization Associated With Age-Related Macular Degeneration Identified by Optical Coherence Tomography Angiography

      Subthreshold Exudative Choroidal Neovascularization Associated With Age-Related Macular Degeneration Identified by Optical Coherence Tomography Angiography

      Purpose: This article describes the clinical and multimodal imaging characteristics of subthreshold exudative choroidal neovascularization (CNV) associated with age-related macular degeneration (AMD). Methods: Among 3773 patients with AMD, 8 eyes (6 patients) were identified with the clinical phenotype of interest. Dilated fundus examinations, color fundus photography, fluorescein angiography (FA), indocyanine green angiography (ICGA), optical coherence tomography (OCT), and OCT angiography (OCTA) were performed. Results: OCT typically showed a moderately reflective irregular pigment epithelial detachment with overlying subretinal fluid (SRF). Traditional FA did not show leakage and ICGA showed no definitive neovascular network or hot spots. However, OCTA clearly demonstrated a ...

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    9. Different Scan Protocols Affect the Detection Rates of Diabetic Retinopathy Lesions by Wide-field Swept-Source Optical Coherence Tomography Angiography

      Different Scan Protocols Affect the Detection Rates of Diabetic Retinopathy Lesions by Wide-field Swept-Source Optical Coherence Tomography Angiography

      Purpose To compare different scan protocols of wide field swept-source optical coherence tomography angiography (SS-OCTA) for the detection of diabetic retinopathy (DR) lesions. Design Comparison of diagnostic approaches. Methods A prospective, observational study was conducted at Mass Eye and Ear from December 2018 to July 2019. Proliferative diabetic retinopathy (PDR), non-proliferative diabetic retinopathy (NPDR) and diabetic patients without DR were included. All patients were imaged with a SS-OCTA using following scan protocol: Angio 3mm×3mm centered on fovea, Angio 6mm×6mm centered on fovea and optic disc, Montage 15mm×9mm and Angio 12mm×12mm centered on fovea and optic disc ...

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    10. Imaging Artifacts and Segmentation Errors With Wide-Field Swept-Source Optical Coherence Tomography Angiography in Diabetic Retinopathy

      Imaging Artifacts and Segmentation Errors With Wide-Field Swept-Source Optical Coherence Tomography Angiography in Diabetic Retinopathy

      Purpose : To analyze imaging artifacts and segmentation errors with wide-field swept-source optical coherence tomography angiography (SS-OCTA) in diabetic retinopathy (DR). Methods : We conducted a prospective, observational study at Massachusetts Eye and Ear from December 2018 to March 2019. Proliferative diabetic retinopathy (PDR), nonproliferative diabetic retinopathy (NPDR), diabetic patients with no diabetic retinopathy (DR), and healthy control eyes were included. All patients were imaged with a SS-OCTA and the Montage Angio (15 × 9 mm) was used for analysis. Images were independently evaluated by two graders using the motion artifact score (MAS). All statistical analyses were performed using SPSS 25.0 and ...

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    11. Quantitative Comparison Of Microvascular Metrics On Three Optical Coherence Tomography Angiography Devices In Chorioretinal Disease

      Quantitative Comparison Of Microvascular Metrics On Three Optical Coherence Tomography Angiography Devices In Chorioretinal Disease

      Purpose: Optical coherence tomography angiography (OCT-A) has emerged as a novel tool for the non-invasive imaging and evaluation of the retinal microvasculature. There is little existing literature that compares OCT-A microvasculature metrics across different OCT-A devices in chorioretinal diseases. Herein, we examined these metrics on three available OCT-A platforms. Patients and methods: All subjects were scanned on each of three OCT-A devices: Optovue Avanti Angiovue, Topcon DRI-OCT Triton Swept-Source OCT, and Zeiss Cirrus 5000-HD-OCT Angioplex. Two investigators independently measured foveal avascular zone (FAZ) area. Superficial capillary plexus (SCP) and deep capillary plexus (DCP) vessel densities (VD) were calculated from binarized ...

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    12. Microperimetry in age-related macular degeneration: association with macular morphology assessed by optical coherence tomography

      Microperimetry in age-related macular degeneration: association with macular morphology assessed by optical coherence tomography

      Background/aims Microperimetry is a technique that is increasingly used to assess visual function in age-related macular degeneration (AMD). In this study, we aimed to evaluate the relationship between retinal sensitivity measured with macular integrity assessment (MAIA) microperimetry and optical coherence tomography (OCT)-based macular morphology in AMD. Methods Prospective, cross-sectional study. All participants were imaged with colour fundus photographs used for AMD staging (Age-Related Eye Disease Study scale), spectral-domain OCT (Spectralis, Heidelberg, Germany) and swept-source OCT (Topcon, Japan). Threshold retinal sensitivity of the central 10° diameter circle was assessed with the full-threshold, 37-point protocol of the MAIA microperimetry device ...

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    13. Choroidal thickness and vascular density in macular telangiectasia type 2 using enface swept-source optical coherence tomography

      Choroidal thickness and vascular density in macular telangiectasia type 2 using enface swept-source optical coherence tomography

      Purpose To investigate the choroidal thickness (CT) and choroidal vascular densities (CVD) of patients with macular telangiectasia type 2 (MacTel2) and their association with other multimodal imaging features, using swept-source optical coherence tomography (SS-OCT). Methods Prospective, cross-sectional study. Consecutive patients with MacTel2 along with controls without any macular disease were included. Fundus photography, confocal blue reflectance, near-infrared reflectance, autofluorescence, fluorescein angiography, spectral domain OCT and SS-OCT were performed. Images were independently analysed by two graders, and CVD was calculated from binarised en face SS-OCT images. CT was obtained from the SS-OCT platform via built-in automated segmentation. Multilevel mixed-effects models were ...

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    14. Visualization of Choriocapillaris and Choroidal Vasculature in Healthy Eyes With En Face Swept-Source Optical Coherence Tomography Versus Angiography

      Visualization of Choriocapillaris and Choroidal Vasculature in Healthy Eyes With En Face Swept-Source Optical Coherence Tomography Versus Angiography

      Purpose : To compare the visualization of the choriocapillaris and deeper choroidal vessels in healthy eyes in en face swept-source optical coherence tomography (SS-OCT) versus SS-OCT angiography (SS-OCTA). Methods : This is a cross-sectional study of consecutive eyes without chorioretinal disease. En face SS-OCT and SS-OCTA images of the choriocapillaris and choroid were assessed for visualization of the vasculature. Choroidal vessel densities (CVD) of the choriocapillaris, inner choroid, midchoroid, and outer choroid were calculated from binarized en face SS-OCT and SS-OCTA images. Paired t -tests and linear regression were used for statistical analysis. Results : Twenty-seven eyes of 27 patients were included. There ...

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    15. Imaging the Deep Choroidal Vasculature Using Spectral Domain and Swept Source Optical Coherence Tomography Angiography

      Imaging the Deep Choroidal Vasculature Using Spectral Domain and Swept Source Optical Coherence Tomography Angiography

      Purpose: To evaluate the deeper choroidal vasculature in eyes with various ocular disorders using spectral domain (SD) optical coherence tomography angiography (OCTA) and swept source (SS) OCTA. Methods: Patients underwent OCTA imaging with either SD-OCTA (Zeiss Cirrus Angioplex or Optovue AngioVue) or SS-OCTA (Topcon Triton). Retinal pigment epithelium (RPE) integrity, structural visualization of deep choroidal vessels on en face imaging, and OCTA of deep choroidal blood flow signal were analyzed. Choroidal blood flow was deemed present if deeper choroidal vessels appeared bright after appropriate segmentation. Results: Structural visualization of choroidal vessels was feasible in all eyes by en face imaging ...

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    16. Evaluation of choroidal lesions with swept-source optical coherence tomography

      Evaluation of choroidal lesions with swept-source optical coherence tomography

      Aims The aim of our study was to image choroidal lesions with swept-source optical coherence tomography (SS-OCT) and to identify the morphological characteristics associated with optimal visualisation. Methods This was a prospective, cross-sectional study. Patients with choroidal melanocytic lesions <3 mm in thickness on B-scan ultrasonography were recruited. All participants underwent SS-OCT. On SS-OCT we evaluated qualitative (eg, lesion outline, detection of scleral-choroidal interface and quality of the image) and quantitative (measurement of maximum lesion thickness and the largest basal diameter) parameters. Probability of optimal image quality was examined using ordered logistic regression models. The main outcome measure was quality ...

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    17. Diabetic Choroidopathy: Choroidal Vascular Density and Volume in Diabetic Retinopathy with Swept-Source Optical Coherence Tomography

      Diabetic Choroidopathy: Choroidal Vascular Density and Volume in Diabetic Retinopathy with Swept-Source Optical Coherence Tomography

      Purpose To compare choroidal vascular density (CVD) and volume (CVV) in diabetic eyes and controls, using en face swept-source optical coherence tomography (SS-OCT). Design Prospective cross-sectional study. Methods ▪▪▪ Setting Multicenter Patient Population 143 diabetic eyes – 27 with no diabetic retinopathy (DR), 47 with nonproliferative DR (NPDR), 51 with NPDR and diabetic macular edema (DME), and 18 with proliferative DR (PDR), and 64 age-matched non-diabetic control eyes. Observation procedures Complete ophthalmologic examination and SS-OCT imaging. En face SS-OCT images of the choroidal vasculature were binarized. Main outcome measures CVD, calculated as the percent area occupied by choroidal vessels in the central ...

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    18. Choroidal Changes Associated with Subretinal Drusenoid Deposits in Age-related Macular Degeneration using Swept-source OCT

      Choroidal Changes Associated with Subretinal Drusenoid Deposits in Age-related Macular Degeneration using Swept-source OCT

      Purpose To compare choroidal vascular features of eyes with and without subretinal drusenoid deposits (SDD), using swept-source optical coherence tomography (SS-OCT). Design Multicenter, cross-sectional study. Methods We prospectively recruited patients with intermediate age-related macular degeneration (AMD), without other vitreoretinal pathology. All participants underwent complete ophthalmic exam, color fundus photography (used for AMD staging), and spectral-domain OCT (to evaluate the presence of SDD). SS-OCT was used to obtain automatic macular choroidal thickness (CT) maps, according to the Early Treatment Diabetic Retinopathy Study (ETDRS) sectors. For data analysis, we considered mean choroidal thickness as the arithmetic mean value of the 9 ETDRS ...

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    19. Spectral-Domain Optical Coherence Tomography as an Indicator of Fluorescein Angiography Leakage from Choroidal Neovascularization

      Spectral-Domain Optical Coherence Tomography as an Indicator of Fluorescein Angiography Leakage from Choroidal Neovascularization

      Purpose: To evaluate spectral-domain optical coherence tomography (SD-OCT) findings that predict angiographic leakage in choroidal neovascularization (CNV). Methods: SD-OCT and fluorescein angiography (FA) images of 93 eyes of 93 patients were retrospectively analyzed. All patients were previously treated with anti-vascular endothelial growth factor agents for CNV from age-related macular degeneration. FA images were analyzed to assess the presence of leakage. SD-OCT images were analyzed to identify the overall presence of fluid, as well as specific patterns of fluid presentation including intraretinal cystic spaces (ICS), retinal pigment epithelium detachment (PED), and neurosensory detachment (NSD). The presence of ultrastructural features such as ...

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    20. Utilizing Targeted Gene Therapy with Nanoparticles Binding Alpha v Beta 3 for Imaging and Treating Choroidal Neovascularization

      Utilizing Targeted Gene Therapy with Nanoparticles Binding Alpha v Beta 3 for Imaging and Treating Choroidal Neovascularization
      Purpose The integrin αvβ3 is differentially expressed on neovascular endothelial cells. We investigated whether a novel intravenously injectable αvβ3 integrin-ligand coupled nanoparticle (NP) can target choroidal neovascular membranes (CNV) for imaging and targeted gene therapy. Methods CNV lesions were induced in rats using laser photocoagulation. The utility of NP for in vivo imaging and gene delivery was evaluated by coupling the NP with a green fluorescing protein plasmid (NP-GFPg). Rhodamine labeling (Rd-NP) was used to localize NP in choroidal flatmounts. Rd-NP-GFPg particles were injected intravenously on weeks 1, 2, or 3. In the treatment arm, rats received NP containing a ...
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    21. Displayed Reflectivity Of Choroidal Neovascular Membranes By Optical Coherence Tomography Correlates With Presence of Leakage By Fluorescein Angiography

      Displayed Reflectivity Of Choroidal Neovascular Membranes By Optical Coherence Tomography Correlates With Presence of Leakage By Fluorescein Angiography

      Purpose: To evaluate and correlate the displayed optical reflectivity of choroidal neovascularization (CNV) subretinal material on spectral-domain optical coherence tomography with the presence of dye leakage on fluorescein angiography (FA).Methods: Thirty-nine eyes of 39 patients with a diagnosis of predominantly classic CNV from age-related macular degeneration underwent simultaneous spectral-domain optical coherence tomography and FA imaging. Eight patients had a newly diagnosed untreated CNV. Thirty-one patients had already been treated with anti-vascular endothelial growth factor agents. In 18 of these eyes, CNV lesions showed persistent leakage on FA. In 13 eyes, CNV lesions did not show leakage by FA. Subretinal ...

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    22. In-vivo evaluation of laser-induced choroidal neovascularization using spectral-domain optical coherence tomography

      In-vivo evaluation of laser-induced choroidal neovascularization using spectral-domain optical coherence tomography
      Purpose. To describe the in-vivo evolution of laser-induced choroidal neovascularization (CNV) in mice using spectral domain optical coherence tomography (SD-OCT) Methods. Laser photocoagulation was applied to the mouse fundus using a 532 nm diode-laser (100,150 and 200 mW, 100 μm diameter, 0.1 sec duration). SD-OCT examination was performed immediately after laser application, and at day 3, 5, 7, 14, 21 and 28 after laser. Fluorescein angiography (FA) was performed at day 5, 7, 14 and 28. Acquired SD-OCT images were analyzed to describe morphologic features, measure CNV size and retinal thickness, and assess the frequency of lesions resulting ...
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    23. Reproducibility of Retinal Thickness Measurements on Normal and Pathologic Eyes by Different Optical Coherence Tomography Instruments

      Reproducibility of Retinal Thickness Measurements on Normal and Pathologic Eyes by Different Optical Coherence Tomography Instruments

      Purpose:To compare retinal thickness measurements produced by different time-domain and spectral-domain optical coherence tomography (TD-OCT and SD-OCT) devices when imaging normal and pathologic eyes.Design:Prospective, observational study in an academic institutional setting.Methods:A total of 110 eyes were imaged by 6 different OCT devices: Stratus and Cirrus (Carl Zeiss Meditec Inc), Spectralis HRA+OCT (Heidelberg Engineering), RTVue-100 (Optovue Inc), SDOCT Copernicus HR (Optopol Technology S.A.), and 3D OCT-1000 (Topcon Corporation). Eyes were normal or affected by different pathologies of the retina, including exudative and nonexudative age-related macular degeneration, epiretinal membrane, cystoid macular edema, and macular hole ...

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    24. Spectral Domain Optical Coherence Tomography for Quantitative Evaluation of Drusen and Associated Structural Changes in Non-Neovascular Age Related Macular Degeneration

      Background/Aims: To demonstrate how spectral domain optical coherence tomography (SDOCT) can better evaluate drusen and associated anatomic changes in eyes with non-neovascular age related macular degeneration (AMD) compared to time domain optical coherence tomography (TDOCT). Methods: Images were obtained from 3 eyes of 3 patients with AMD using an experimental SDOCT system. Both a Titanium-sapphire (Ti:Sapphire) laser and a superluminescent diode (SLD) was used as a broadband light source to achieve cross-sectional images of the retina. Qualitative and quantitative analysis was done of structural changes associated with non-neovascular AMD. An automated algorithm was developed to analyze drusen size ...

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    1-24 of 24
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    Reproducibility of Retinal Thickness Measurements on Normal and Pathologic Eyes by Different Optical Coherence Tomography Instruments In-vivo evaluation of laser-induced choroidal neovascularization using spectral-domain optical coherence tomography Displayed Reflectivity Of Choroidal Neovascular Membranes By Optical Coherence Tomography Correlates With Presence of Leakage By Fluorescein Angiography Utilizing Targeted Gene Therapy with Nanoparticles Binding Alpha v Beta 3 for Imaging and Treating Choroidal Neovascularization Spectral-Domain Optical Coherence Tomography as an Indicator of Fluorescein Angiography Leakage from Choroidal Neovascularization Choroidal Changes Associated with Subretinal Drusenoid Deposits in Age-related Macular Degeneration using Swept-source OCT Diabetic Choroidopathy: Choroidal Vascular Density and Volume in Diabetic Retinopathy with Swept-Source Optical Coherence Tomography Imaging the Deep Choroidal Vasculature Using Spectral Domain and Swept Source Optical Coherence Tomography Angiography Visualization of Choriocapillaris and Choroidal Vasculature in Healthy Eyes With En Face Swept-Source Optical Coherence Tomography Versus Angiography Cascade Optical Coherence Tomography (C-OCT) for Surface Form Metrology of - ProQuest Comparison of Anterior Segment Measurements with a New Multifunctional Unit and Five Other Devices Efficacy of Notal Vision Home OCT demonstrated by a series of scientific and clinical work