1. Articles from Narendra K. Puttaiah

    1-14 of 14
    1. Optical Coherence Tomography Angiography and Visual Field Progression in Primary Angle Closure Glaucoma

      Optical Coherence Tomography Angiography and Visual Field Progression in Primary Angle Closure Glaucoma

      Precis: Lower whole enface disc (coefficient: 0.02, P =0.03) and macular vessel densities (coefficient: 0.04, P =0.02) on OCT angiography were significantly associated with faster rate of mean deviation decline. Purpose: To evaluate the association between optical coherence tomography angiography (OCTA) features and prior visual field (VF) progression in primary angle closure glaucoma (PACG). Methods: In a cross-sectional study, 46 eyes of 31 PACG patients with 5 reliable VF examinations performed over ≥3 years of follow-up underwent OCTA imaging. Effect of clinical (age, gender, number of anti-glaucoma medications, mean and SD of intraocular pressure during follow-up ...

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    2. Repeatability and comparability of peripapillary vessel density measurements of high-density and non-high-density optical coherence tomography angiography scans in normal and glaucoma eyes

      Repeatability and comparability of peripapillary vessel density measurements of high-density and non-high-density optical coherence tomography angiography scans in normal and glaucoma eyes

      Aims To compare the peripapillary vessel density (VD) measurements of high-density (HD) and non-HD optical coherence tomography angiography (OCTA) scans in normal and glaucoma eyes, and to evaluate the intrasession repeatability of VD measurements of HD scans. Methods In a cross-sectional study, 46 normal (33 subjects) and 89 glaucoma (64 patients) eyes underwent 3 HD and 1 non-HD optic nerve head OCTA scans in the same session. Agreement in VD measurements between HD and non-HD scans was assessed using Bland and Altman analysis. Repeatability of the VD measurements of HD scans was assessed using within-subject coefficient of repeatability (CRw) and ...

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    3. Diagnostic Abilities of the Optical Microangiography Parameters of the 3×3 mm and 6×6 mm Macular Scans in Glaucoma

      Diagnostic Abilities of the Optical Microangiography Parameters of the 3×3 mm and 6×6 mm Macular Scans in Glaucoma

      Purpose: To evaluate the diagnostic abilities of macular vessel length and perfusion densities measured with optical microangiography (OMAG) over a 3×3 mm and a 6×6 mm region, and to compare these with macular ganglion cell-inner plexiform layer (GCIPL) thickness in eyes with primary open-angle glaucoma (POAG). Methods: In a cross-sectional study, 96 eyes of 57 control subjects and 88 eyes of 57 POAG patients underwent macular imaging with optical coherence tomography. Area under receiver operating characteristic curves (AUC) and sensitivities at 90% specificity of OMAG and GCIPL parameters were evaluated. Results: Most OMAG parameters of the 3×3 ...

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    4. Relationship of Macular Thickness and Function to Optical Microangiography Measurements in Glaucoma

      Relationship of Macular Thickness and Function to Optical Microangiography Measurements in Glaucoma

      Purpose: The purpose of this article was to evaluate the relationship between macular optical microangiography (OMAG), ganglion cell-inner plexiform layer (GCIPL) thickness, and visual sensitivity measurements of different macular sectors in primary open-angle glaucoma. Methods: In a cross-sectional study, 39 eyes of 26 primary open-angle glaucoma patients underwent optical coherence tomography imaging and 10-2 visual field examination of the macula in the same session. Linear regression models were used to evaluate the relationships between OMAG, GCIPL thickness, and visual sensitivity measurements in different macular sectors. Strength of relationship was reported as coefficient of determination ( R 2 ). Results: R 2 values ...

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    5. Optical Coherence Tomography Angiography Vessel Density Measurements in Eyes with Primary Open Angle Glaucoma and Disc Hemorrhage

      Optical Coherence Tomography Angiography Vessel Density Measurements in Eyes with Primary Open Angle Glaucoma and Disc Hemorrhage

      Purpose: To compare the vessel density measurements of optic nerve head (ONH), peripapillary and macular regions in severity-matched primary open angle glaucoma (POAG) eyes with and without disc hemorrhage (DH) using optical coherence tomography (OCT) angiography (OCTA), and to compare their diagnostic abilities with that of the rim area, retinal nerve fiber layer and the ganglion cell complex thickness measurements on OCT. Methods: In a cross-sectional study, 66 eyes of 46 control subjects, 34 eyes of 33 POAG patients with DH (median mean deviation, MD: -3.7 dB) and 63 eyes of 43 POAG patients without DH (median MD: -3 ...

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    6. Relationship of Optic Nerve Structure and Function to Peripapillary Vessel Density Measurements of Optical Coherence Tomography Angiography in Glaucoma

      Relationship of Optic Nerve Structure and Function to Peripapillary Vessel Density Measurements of Optical Coherence Tomography Angiography in Glaucoma

      Purpose: To evaluate the sectoral and global structure-structure (vessel density-retinal nerve fiber layer thickness) and structure-function (vessel density-visual sensitivity loss) relationships of peripapillary vessel density measurements on optical coherence tomography angiography in primary open-angle glaucoma and to determine if fractional polynomial (FP) models characterize the relationships better than linear models. Materials and Methods: In a cross-sectional study, structure-structure and structure-function relationships of peripapillary vessel densities were determined in 227 eyes of 143 subjects (63 control and 164 primary open-angle glaucoma eyes) who had undergone standard automated perimetry and optical coherence tomography testing within 6 months of each other, using linear ...

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    7. A comparison of the diagnostic ability of vessel density and structural measurements of optical coherence tomography in primary open angle glaucoma

      A comparison of the diagnostic ability of vessel density and structural measurements of optical coherence tomography in primary open angle glaucoma

      Purpose To compare the diagnostic abilities of vessel density measurements of the optic nerve head (ONH), peripapillary and macular regions on optical coherence tomography (OCT) angiography in eyes with primary open angle glaucoma (POAG) with that of the ONH rim area, peripapillary retinal nerve fiber layer (RNFL) thickness and the macular ganglion cell complex (GCC) thickness measurements. Methods In a cross sectional study, 78 eyes of 50 control subjects and 117 eyes of 67 POAG patients underwent vessel density and structural measurements with spectral domain OCT. POAG was diagnosed based on the masked evaluation of optic disc stereo photographs. Area ...

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    8. Determinants of Peripapillary and Macular Vessel Densities Measured by Optical Coherence Tomography Angiography in Normal Eyes

      Determinants of Peripapillary and Macular Vessel Densities Measured by Optical Coherence Tomography Angiography in Normal Eyes

      PURPOSE The aim of this study was to evaluate the effect of subject-related (age, sex, and systemic hypertension and diabetes), eye-related (refractive error, optic disc size), and technology-related (signal strength index, SSI of the scans) determinants on the peripapillary and macular vessel densities measured with optical coherence tomography angiography (OCTA) in normal eyes. METHODS In a cross-sectional study, 181 normal eyes of 107 subjects (45 men, 62 women, median age: 50 y, range: 18 to 77 y) underwent OCTA imaging. Linear mixed models were used to analyze the effect of the determinants on the peripapillary and macular vessel densities measured ...

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    9. Vessel density and structural measurements of optical coherence tomography in primary angle closure and primary angle closure glaucoma

      Vessel density and structural measurements of optical coherence tomography in primary angle closure and primary angle closure glaucoma

      Purpose To evaluate the vessel density measurements of the optic nerve head (ONH), peripapillary and macular regions on optical coherence tomography (OCT) angiography in eyes with primary angle closure (PAC) and primary angle closure glaucoma (PACG), and to compare their diagnostic abilities with the ONH rim area, peripapillary retinal nerve fiber layer (RNFL) thickness and the macular ganglion cell complex (GCC) thickness measurements on OCT in PACG. Design Cross-sectional study Methods Seventy-seven eyes of 50 control subjects, 65 eyes of 45 patients with PACG, and 31 eyes of 22 PAC patients with a history of high IOP, underwent imaging with ...

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    10. Diagnostic ability of peripapillary vessel density measurements of optical coherence tomography angiography in primary open-angle and angle-closure glaucoma

      Diagnostic ability of peripapillary vessel density measurements of optical coherence tomography angiography in primary open-angle and angle-closure glaucoma

      Aims To evaluate the diagnostic ability of peripapillary vessel density measurements on optical coherence tomography angiography (OCTA) in primary open-angle glaucoma (POAG) and primary angle-closure glaucoma (PACG), and to compare these with peripapillary retinal nerve fibre layer (RNFL) thickness measurements. Methods In a cross-sectional study, 48 eyes of 33 healthy control subjects, 63 eyes of 39 patients with POAG and 49 eyes of 32 patients with PACG underwent OCTA (RTVue-XR, Optovue, Fremont, California, USA) and RNFL imaging with spectral domain OCT. Diagnostic abilities of vessel density and RNFL parameters were evaluated using area under receiver operating characteristic curves (AUC) and ...

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    11. Predicting the intereye asymmetry in functional and structural damage in glaucoma using automated pupillography

      Predicting the intereye asymmetry in functional and structural damage in glaucoma using automated pupillography

      Purpose To predict the intereye asymmetry in functional (mean deviation, MD on visual field, VF) and structural (retinal nerve fibre layer, RNFL and ganglion cell complex, GCC thickness on spectral domain optical coherence tomography, SDOCT) measurements in glaucoma using the automated pupillography parameters. Methods Fifty-nine subjects with a diagnosis of either glaucoma or glaucoma suspect underwent automated pupillography along with VF and SDOCT examinations. Association between pupillography and the absolute intereye difference in MD, RNFL and GCC measurements was evaluated using regression analysis after accounting for the multicollinearity. Results Univariate regression analysis showed statistically significant associations (p < 0.05) between ...

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    12. Regional comparisons of optical coherence tomography angiography vessel density in primary open angle glaucoma

      Regional comparisons of optical coherence tomography angiography vessel density in primary open angle glaucoma

      Purpose To compare the diagnostic abilities of the vessel densities in optic nerve head (ONH), peripapillary and macular regions measured using optical coherence tomography angiography (OCTA) in eyes with primary open angle glaucoma (POAG), and to evaluate the effect of glaucoma severity (based on the mean deviation, MD), optic disc size and pre-treatment intraocular pressure (IOP). Design Cross-sectional study Methods Seventy-eight eyes of 53 control subjects and 64 eyes of 39 POAG patients underwent OCTA imaging. Area under receiver operating characteristic (ROC) curves (AUC) and sensitivities at fixed specificities of vessel densities in ONH, peripapillary and macular regions were analyzed ...

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    13. Biometry with a new swept-source optical coherence tomography biometer: Repeatability and agreement with an optical low-coherence reflectometry device

      Biometry with a new swept-source optical coherence tomography biometer: Repeatability and agreement with an optical low-coherence reflectometry device

      Purpose To assess the repeatability of a new swept-source optical coherence tomography (SS-OCT) biometer (IOLMaster 700) and evaluate the agreement with an optical low-coherence reflectometry (OLCR) biometer (Lenstar 900) in cataractous eyes. Setting Tertiary eyecare facility. Design Prospective evaluation of a diagnostic test. Methods Eyes of patients had 3 consecutive scans acquired by the same operator. The repeatability of measurements was assessed using the within-subject standard deviation and coefficient of variation (CoV). Agreement between the mean measurements of each machine was evaluated. Results The study comprised 100 eyes of 100 patients. The median lens thickness and axial length (AL) measurements ...

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    14. A Pilot Study on Feasibility and Effectiveness of Intraoperative Spectral-Domain Optical Coherence Tomography in Glaucoma Procedures

      A Pilot Study on Feasibility and Effectiveness of Intraoperative Spectral-Domain Optical Coherence Tomography in Glaucoma Procedures

      Purpose: To demonstrate the use of a spectral-domain optical coherence tomography (SDOCT) integrated surgical microscope in glaucoma surgery. Methods: An SDOCT system was used to interface directly with an ophthalmic surgical microscope, to allow real-time intraoperative SDOCT ( i OCT) imaging during glaucoma procedures like phaco-trabeculectomy, Ahmed glaucoma valve (AGV) implantation, gonio-synechiolysis, and bleb needling. The various surgical steps during glaucoma surgeries where i OCT can be of potential help in guiding the surgeon were recorded. Results: High-resolution, cross-sectional images of the relevant structures were achieved with the i OCT system in all procedures. The surgeon could determine the depth of ...

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      Mentions: Rohit Shetty
    1-14 of 14
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    A Pilot Study on Feasibility and Effectiveness of Intraoperative Spectral-Domain Optical Coherence Tomography in Glaucoma Procedures Biometry with a new swept-source optical coherence tomography biometer: Repeatability and agreement with an optical low-coherence reflectometry device Regional comparisons of optical coherence tomography angiography vessel density in primary open angle glaucoma Predicting the intereye asymmetry in functional and structural damage in glaucoma using automated pupillography Diagnostic ability of peripapillary vessel density measurements of optical coherence tomography angiography in primary open-angle and angle-closure glaucoma Vessel density and structural measurements of optical coherence tomography in primary angle closure and primary angle closure glaucoma Determinants of Peripapillary and Macular Vessel Densities Measured by Optical Coherence Tomography Angiography in Normal Eyes A comparison of the diagnostic ability of vessel density and structural measurements of optical coherence tomography in primary open angle glaucoma Relationship of Optic Nerve Structure and Function to Peripapillary Vessel Density Measurements of Optical Coherence Tomography Angiography in Glaucoma Optical Coherence Tomography Angiography and Visual Field Progression in Primary Angle Closure Glaucoma Deep learning differentiates between healthy and diabetic mouse ears from optical coherence tomography angiography images Spectral-Domain Optical Coherence Tomography For Evaluating Palisades of Vogt in Ocular Surface Disorders With Limbal Involvement