1. Balwantray C. Chauhan

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    1. Mentioned In 19 Articles

    2. Asymmetry analysis of macular optical coherence tomography angiography in patients with glaucoma and healthy subjects

      Asymmetry analysis of macular optical coherence tomography angiography in patients with glaucoma and healthy subjects
      Background/aims Quantitative analysis of optical coherence tomography angiography (OCT-A) images requires a reproducible approach that accounts for sectoral loss. The objective of this study was to determine whether an index that accounts for both global (perfusion density, PD) and asymmetric loss of perfusion, rather than PD alone, more reliably measures loss of perfusion in patients with glaucoma. Methods We analysed macular OCT-A scans of 95 glaucoma patients and 59 ...
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    3. OCT Structural Abnormality Detection in Glaucoma using Topographically Correspondent Rim and Retinal Nerve Fiber Layer Criteria

      OCT Structural Abnormality Detection in Glaucoma using Topographically Correspondent Rim and Retinal Nerve Fiber Layer Criteria
      Purpose To evaluate the ability of topographically correspondent (TC) minimum rim width (MRW) and peripapillary retinal nerve fiber layer thickness (pRNFLT) criteria to detect optical coherence tomography (OCT) structural abnormality in glaucoma (GL) and glaucoma suspect (GLS) eyes. Design Retrospective cross-sectional study. Methods 196 GL, 150 GLS eyes and 303 Heathy eyes underwent PRNFL and 24 radial optic nerve head OCT imaging and manual correction of the internal limiting membrane ...
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    4. Influence of Bruch’s Membrane Opening Area in Diagnosing Glaucoma with Neuroretinal Parameters from Optical Coherence Tomography

      Influence of Bruch’s Membrane Opening Area in Diagnosing Glaucoma with Neuroretinal Parameters from Optical Coherence Tomography
      Purpose To determine whether the glaucoma diagnostic accuracy of age and Bruchs membrane opening area (BMOA) adjusted normative classifications of minimum rim width (MRW) and retinal nerve fibre layer thickness (RNFLT) is dependent on BMOA, in a European descent population. Design Retrospective, cross-sectional study. Methods We included 182 glaucoma patients and 166 healthy controls for the primary study, and 105 glaucoma patients in a second sample used for a replication ...
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    5. OCT-Detected Optic Nerve Head Neural Canal Direction, Obliqueness and Minimum Cross-Sectional Area in Healthy Eyes

      OCT-Detected Optic Nerve Head Neural Canal Direction, Obliqueness and Minimum Cross-Sectional Area in Healthy Eyes
      Purpose To assess anterior scleral canal opening (ASCO) offset relative to Bruchs membrane opening (BMO) (ASCO/BMO offset) so as to determine neural canal direction, obliqueness, and minimum cross-sectional area (NCMCA) in 362 healthy eyes. Design Cross-sectional study Methods After OCT optic nerve head (ONH) and retinal nerve fiber layer thickness (RNFLT) imaging, BMO and ASCO were manually segmented and planes, centroids, size and shape were calculated. Neural canal direction ...
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    6. Optical Coherence Tomography Angiography in Mice: Quantitative Analysis After Experimental Models of Retinal Damage

      Optical Coherence Tomography Angiography in Mice: Quantitative Analysis After Experimental Models of Retinal Damage
      Purpose : We implemented optical coherence tomography angiography (OCT-A) in mice to: (1) develop quantitative parameters from OCT-A images, (2) measure the reproducibility of the parameters, and (3) determine the impact of experimental models of inner and outer retinal damage on OCT-A findings. Methods : OCT-A images were acquired with a customized system (Spectralis Multiline OCT2). To assess reproducibility, imaging was performed five times over 1 month. Inner retinal damage was induced ...
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    7. Factors Influencing Optical Coherence Tomography Peripapillary Choroidal Thickness: A Multicenter Study

      Factors Influencing Optical Coherence Tomography Peripapillary Choroidal Thickness: A Multicenter Study
      Purpose : To quantify peripapillary choroidal thickness (PCT) and the factors that influence it in healthy participants who represent the racial and ethnic composition of the U.S. population. Methods : A total of 362 healthy participants underwent optical coherence tomography (OCT) enhanced depth imaging of the optic nerve head with a 24 radial B-scan pattern aligned to the fovea to Bruch's membrane opening axis. Bruch's membrane, anterior scleral canal ...
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    8. Impact of Head Tilt on Optical Coherence Tomography Image Orientation

      Impact of Head Tilt on Optical Coherence Tomography Image Orientation
      Purpose: Head tilt can have an impact on the orientation of posterior pole images. We conducted this study to determine the effect of head tilt on image orientation measured by the fovea - Bruchs membrane opening (FoBMO) angle with optical coherence tomography (OCT) imaging. Methods: The study included 56 healthy subjects with mean (range) age of 33 (18-61) years. The dominant eye was first determined. To measure head tilt , a smartphone ...
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    9. Visibility of Optic Nerve Head Structures With Spectral-domain and Swept-source Optical Coherence Tomography

      Visibility of Optic Nerve Head Structures With Spectral-domain and Swept-source Optical Coherence Tomography
      Purpose: To compare the visibility of deep optic nerve head (ONH) structures and the visible area of the anterior surface of the lamina cribrosa (ASLC) with spectral-domain optical coherence tomography (SD-OCT) and swept-source OCT (SS-OCT). Materials and Methods: In total, 33 glaucoma patients were imaged with SD-OCT (Spectralis, 24 radial B-scans centered on the ONH) and SS-OCT (Atlantis, 12 radial and a horizontal and vertical raster scan pattern containing 5 ...
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    10. Heidelberg Engineering Receives FDA Clearance to Market SPECTRALIS® OCT Glaucoma Module Premium Edition

      Heidelberg Engineering Receives FDA Clearance to Market SPECTRALIS® OCT Glaucoma Module Premium Edition
      ... premise of the Glaucoma Module Premium Edition is based on research collaborations between two groups led by Balwantray C. Chauhan, Ph.D., Dalhousie University in Halifax (Canada), and Claude F. Burgoyne, M.D., Devers E...
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    11. Diagnostic Accuracy of Optical Coherence Tomography and Scanning Laser Tomography for Identifying Glaucoma in Myopic Eyes

      Diagnostic Accuracy of Optical Coherence Tomography and Scanning Laser Tomography for Identifying Glaucoma in Myopic Eyes
      Purpose Ruling out glaucoma in myopic eyes often poses a diagnostic challenge because of atypical optic disc morphology and visual field defects that can mimic glaucoma. We determined whether neuroretinal rim assessment based on Bruch's membrane opening (BMO), rather than conventional optic disc margin (DM)-based assessment or retinal nerve fiber layer (RNFL) thickness, yielded higher diagnostic accuracy in myopic patients with glaucoma. Design Case-control, cross-sectional study. Participants Myopic ...
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    12. Enhanced Detection of Open-angle Glaucoma with an Anatomically Accurate Optical Coherence Tomography–Derived Neuroretinal Rim Parameter

      Enhanced Detection of Open-angle Glaucoma with an Anatomically Accurate Optical Coherence Tomography–Derived Neuroretinal Rim Parameter
      ...ciences, Dalhousie University, Halifax, Nova Scotia, Canada + Corresponding Author Information Correspondence Balwantray C. Chauhan, PhD, Department of Ophthalmology and Visual Sciences, Dalhousie University, 1276 South ...
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    13. Laminar Displacement and Prelaminar Tissue Thickness Change after Glaucoma Surgery Imaged with Optical Coherence Tomography

      Laminar Displacement and Prelaminar Tissue Thickness Change after Glaucoma Surgery Imaged with Optical Coherence Tomography
      Purpose: To study changes in lamina cribrosa position and prelaminar tissue thickness (PTT) after surgical intraocular pressure (IOP) reduction in glaucoma patients. Methods: Twenty-two patients (mean age, 71.4 years) were imaged with spectral domain optical coherence tomography (SD-OCT, 24 radial B-scans centered on the optic nerve head) before trabeculectomy or tube shunt implantation. Follow-up images were acquired 1 week, 1 month, 3 and 6 months post-surgery. Bruch's membrane ...
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    14. Optic Disc Margin Anatomy in Patients with Glaucoma and Normal Controls with Spectral Domain Optical Coherence Tomography

      Optic Disc Margin Anatomy in Patients with Glaucoma and Normal Controls with Spectral Domain Optical Coherence Tomography
      ...^2, * Glen P. Sharpe, MSc^1, * Hongli Yang, PhD^3, * Marcelo T. Nicolela, MD^1, * Claude F. Burgoyne, MD^3, * Balwantray C. Chauhan, PhD^1^, Corresponding author contact information ^, E-mail the corresponding author * ^...
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  2. About Balwantray C. Chauhan

    Balwantray C. Chauhan

    Balwantray C. Chauhan is from the Department of Ophthalmology and Visual Sciences, Dalhousie University, Halifax, Nova Scotia, Canada.