1. Articles from Kalluri Viswanath

    1-7 of 7
    1. Influence of disc area on retinal nerve fiber layer thickness measurement by spectral domain optical coherence tomography

      Influence of disc area on retinal nerve fiber layer thickness measurement by spectral domain optical coherence tomography

      Background: To examine the effect of optic disc area on peripapillary RNFLT (retinal nerve fiber layer thickness) measurement at circle diameter of 3.4 mm around optic nerve head using spectral OCT/SLO (Optical coherence tomography/scanning laser ophthalmoscope). Materials and Methods : In this prospective, cross sectional study, one hundred and two eyes of 102 normal subjects underwent RNFLT and disc area measurement using spectral OCT/SLO. Based on disc area, subjects were divided into three groups i.e., <3 mm 2 (32 eyes), 3-4 mm 2 (36 eyes) and >4 mm 2 (34 eyes). The effect of disc area ...

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    2. Quantification of retinal nerve fiber layer thickness using spectral domain optical coherence tomography in normal Indian population

      Quantification of retinal nerve fiber layer thickness using spectral domain optical coherence tomography in normal Indian population

      The purpose of this study was to measure peripapillary retinal nerve fiber layer thickness (RNFLT) using spectral domain optical coherence tomography (SD-OCT) in normal Indian eyes, for which, 210 normal volunteers were recruited. One eye of each subject underwent RNFL scanning at 3.4 mm circle diameter around optic nerve using SD OCT. The data were analyzed to determine RNFLT in the sample population and its variation with age and gender. The average peripapillary RNFLT was 114.03 ± 9.59 μm. There was no effect of gender on RNFLT parameters. Age had significant negative correlation with average ( P = 0.005 ...

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    3. Ability of spectral domain optical coherence tomography peripapillary retinal nerve fiber layer thickness measurements to identify early glaucoma

      Ability of spectral domain optical coherence tomography peripapillary retinal nerve fiber layer thickness measurements to identify early glaucoma
      Purpose : To evaluate the ability of spectral domain optical coherence tomography (OCT) peripapillary retinal nerve fiber layer thickness (RNFLT) parameters to distinguish normal eyes from those with early glaucoma in Asian Indian eyes. Design : Observational cross-sectional study. Materials and Methods : One hundred and seventy eight eyes (83 glaucoma patients and 95 age matched healthy subjects) of subjects more than 40 years of age were included in the study. All subjects underwent RNFLT measurement with spectral OCT/ scanning laser ophthalmoscope (SLO) after dilatation. Sensitivity, specificity and area under the receiving operating characteristic curve (AROC) were calculated for various OCT peripapillary RNFL ...
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    4. Reproducibility of peripapillary retinal nerve fibre layer thickness measurements with spectral domain optical coherence tomography in normal and glaucomatous eyes

      Reproducibility of peripapillary retinal nerve fibre layer thickness measurements with spectral domain optical coherence tomography in normal and glaucomatous eyes
      Aim To determine reproducibility of peripapillary retinal nerve fibre layer thickness (RNFLT) measurements by spectral optical coherence tomography scanning laser ophthalmoscope (Spectral OCT/SLO) in normal and glaucomatous eyes. Methods 61 normal subjects and 41 glaucoma patients underwent three RNFLT measurement by Spectral OCT/SLO in one of the eyes with a rest of 1 h between each scan. The series was repeated on three different days within 1-month period. Intrasession, intersession reproducibility of average, quadrant and clock hour RNFLT measurements were calculated for both groups. All scans were acquired by a single operator after dilation. Results The intrasession intraclass ...
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    5. Quantification of Retinal Nerve Fiber Layer Thickness in Normal Eyes, Eyes With Ocular Hypertension, and Glaucomatous Eyes With SD-OCT

      Quantification of Retinal Nerve Fiber Layer Thickness in Normal Eyes, Eyes With Ocular Hypertension, and Glaucomatous Eyes With SD-OCT
      BACKGROUND AND OBJECTIVE To quantitatively evaluate and compare retinal nerve fiber layer (RNFL) thickness between normal eyes, eyes with ocular hypertension (OHT), and glaucomatous eyes in an Indian population using spectral domain optical coherence tomography (SD-OCT). PATIENTS AND METHODS Average and quadrant RNFL values were compared among three groups (66 normal eyes, 55 OHT eyes, and 51 glaucomatous eyes) and the discriminating power of each parameter was evaluated by calculating areas under receiver operator curves (AROCs). RESULTS The mean RNFL thickness was 93.45 ± 16.9 µm in glaucomatous eyes, significantly less than in normal (112.48 ± 6.8 µm ...
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    6. Optic disc topography in normal Indian eyes using spectral domain optical coherence tomography

      Optic disc topography in normal Indian eyes using spectral domain optical coherence tomography
      Purpose: The aim was to study optic nerve head (ONH) parameters in normal Indian eyes using spectral domain optical coherence tomography (OCT)/scanning laser ophthamoscope (SLO). Materials and Methods: One hundred and fifty-seven eyes of 157 normal subjects of various age groups underwent ONH imaging with spectral OCT/SLO and the parameters obtained were correlated with disc size. The effect of age, gender, and refractive error on various ONH parameters were also studied. Results: The mean optic disc area was 3.36 ± 0.64 mm 2 (range, 2.13-5.08 mm 2 ), mean rim area was 2.49 ± 0.58 ...
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    7. Correlation Between Peripapillary Retinal Nerve Fiber Layer Thickness and Optic Nerve Head Parameters Using Spectral Domain Optical Coherence Tomography

      Aim: To evaluate correlation between peripapillary retinal nerve fiber layer thickness (RNFL) and optic nerve head (ONH) parameters in normal participants using Spectral domain optical coherence tomography (OCT). Methods: Sixty-five eyes of 65 healthy participants aged 13-79 years underwent ONH analysis and peripapillary RNFL thickness measurements using spectral domain OCT. The RNFL measurements were correlated with the data obtained with ONH analysis. Results: The average and quadrant RNFL thickness did not show correlation with optic disc area. A positive correlation was found between average RNFL thickness and rim area (r=0.425, P=0.000) and negative correlation between average ...
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    1-7 of 7
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    Optic disc topography in normal Indian eyes using spectral domain optical coherence tomography Quantification of Retinal Nerve Fiber Layer Thickness in Normal Eyes, Eyes With Ocular Hypertension, and Glaucomatous Eyes With SD-OCT Reproducibility of peripapillary retinal nerve fibre layer thickness measurements with spectral domain optical coherence tomography in normal and glaucomatous eyes Ability of spectral domain optical coherence tomography peripapillary retinal nerve fiber layer thickness measurements to identify early glaucoma Quantification of retinal nerve fiber layer thickness using spectral domain optical coherence tomography in normal Indian population Influence of disc area on retinal nerve fiber layer thickness measurement by spectral domain optical coherence tomography Functional optical coherence tomography of neurovascular coupling interactions in the retina Emerging Applications of Optical Coherence Tomography Angiography (OCTA) in neurological research Multiscale skin imaging in vivo using optical coherence tomography Foveal Avascular Zone Area Analysis in Macular Hole Before and After Surgery Using Optical Coherence Tomography Angiography Vitreous Bands Identified by Handheld Spectral-Domain Optical Coherence Tomography Among Premature Infants Utility of optical coherence tomography in the evaluation of sellar and parasellar mass lesions