1. Ravi S. Jonnal

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    1. Mentioned In 18 Articles

    2. The Properties of Outer Retinal Band Three Investigated With Adaptive-Optics Optical Coherence Tomography

      Explore IOVS Journal Ophthalmology
      The Properties of Outer Retinal Band Three Investigated With Adaptive-Optics Optical Coherence Tomography
      Purpose : Optical coherence tomography's (OCT) third outer retinal band has been attributed to the zone of interdigitation between RPE cells and cone outer segments. The purpose of this paper is to investigate the structure of this band with adaptive optics (AO)-OCT. Methods : Using AO-OCT, images were obtained from two subjects. Axial structure was characterized by measuring band 3 thickness and separation between bands 2 and 3 in segmented ...
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      Mentions: John S. Werner UC Davis Robert J. Zawadzki

    3. Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system

      Explore Conference Proceedings
      Imaging of the human choroid with a 1.7 MHz A-scan rate FDML swept source OCT system
      We demonstrate OCT angiography (OCTA) and Doppler OCT imaging of the choroid in the eyes of two healthy volunteers and in a geographic atrophy case. We show that visualization of specific choroidal layers requires selection of appropriate OCTA methods. We investigate how imaging speed, B-scan averaging and scanning density influence visualization of various choroidal vessels. We introduce spatial power spectrum analysis of OCT en face angiographic projections as a method ...
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      Mentions: John S. Werner UC Davis Robert J. Zawadzki

    4. UCDavis Receives NIH Grant for Properties of Photoreceptoers and Muller Cells Investigated with AO-OCT

      Explore Optical Coherence Tomography News Ophthalmology , Funding
      UCDavis Receives NIH Grant for Properties of Photoreceptoers and Muller Cells Investigated with AO-OCT
      The University of California at Davis Receives a 2017 NIH Grant for $97,834 for Properties of Photoreceptoers and Muller Cells Investigated with AO-OCT. The principal investigator is Ravi Jonnal. The program began in 2016 and ends in 2017. Below is a summary of the proposed work. The research proposed for this award will examine functional and structural properties of single cells in the human retina. The three Aims will ...
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      Mentions: National Institutes of Health John S. Werner UC Davis

    5. Photoreceptor disc shedding in the living human eye

      Explore OSA | OSA Publishing Ophthalmology
      Photoreceptor disc shedding in the living human eye
      Cone photoreceptors undergo a daily cycle of renewal and shedding of membranous discs in their outer segments (OS), the portion responsible for light capture. These physiological processes are fundamental to maintaining photoreceptor health, and their dysfunction is associated with numerous retinal diseases. While both processes have been extensively studied in animal models and postmortem eyes, little is known about them in the living eye, in particular human. In this study ...
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      Mentions: UC Davis Ravi S. Jonnal Donald T. Miller

    6. A Review of Adaptive Optics Optical Coherence Tomography: Technical Advances, Scientific Applications, and the Future

      Explore IOVS Journal Ophthalmology
      A Review of Adaptive Optics Optical Coherence Tomography: Technical Advances, Scientific Applications, and the Future
      Purpose : Optical coherence tomography (OCT) has enabled virtual biopsy of the living human retina, revolutionizing both basic retina research and clinical practice over the past 25 years. For most of those years, in parallel, adaptive optics (AO) has been used to improve the transverse resolution of ophthalmoscopes to foster in vivo study of the retina at the microscopic level. Here, we review work done over the last 15 years to ...
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      Mentions: John S. Werner UC Davis Robert J. Zawadzki

    7. The cellular origins of the outer retinal bands in optical coherence tomography images

      Explore iovs.org Ophthalmology
      The cellular origins of the outer retinal bands in optical coherence tomography images
      Purpose: To test the recently proposed hypothesis that the second OCT outer retinal band originates from the inner segment ellipsoid, by measuring: 1) thickness of this band within single cones, and 2) its respective distance from the external limiting membrane and outer segment tips. Methods: Adaptive optics OCT images were obtained from four normal subjects. Images were obtained at foveal (2∘) and perifoveal (5∘) locations. Cones (n = 9593) were identified ...
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      Mentions: John S. Werner University of Southern California Robert J. Zawadzki

    9. Adaptive optics optical coherence tomography for measuring phase and reflectance dynamics of photoreceptors

      Explore Linking to Scitation Content Ophthalmology
      Adaptive optics optical coherence tomography for measuring phase and reflectance dynamics of photoreceptors
      Optical coherence tomography with adaptive optics (AO-OCT) is a noninvasive method for imaging the living retina at the microscopic level. We used AO-OCT technology to follow changes in cone photoreceptor outer segment (OS) length and reflectance. To substantially increase sensitivity of the length measurements, a novel phase retrieval technique was demonstrated, capable of detecting changes on a nanometer scale. We acquired volume videos of 0.65°x0.65° retinal patches ...
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      Mentions: Qiang Wang Ravi S. Jonnal Donald T. Miller

    16. Volumetric retinal imaging with ultrahigh-resolution spectral-domain optical coherence tomography and adaptive optics using two broadband light sources

      Explore opticsinfobase.org Ophthalmology , Broadband Sources
      Volumetric retinal imaging with ultrahigh-resolution spectral-domain optical coherence tomography and adaptive optics using two broadband light sources
      ... - noninvasive assessment Citation Barry Cense, Erik Koperda, Jeffrey M. Brown, Omer P. Kocaoglu, Weihua Gao, Ravi S. Jonnal, and Donald T. Miller, "Volumetric retinal imaging with ultrahigh-resolution spectral-domain o...
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      Mentions: Weihua Gao Barry Cense Ravi S. Jonnal
    17. 1-15 of 18 1 2 »
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  4. About Ravi S. Jonnal

    Ravi S. Jonnal

    Ravi S. Jonnal is a project scientist at UC Davis.

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      17 articles also mentioned Donald T. Miller
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    3. Imaging Retinal Capillaries Using Ultrahigh-Resolution Optical Coherence Tomography and Adaptive Optics
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    4. The cellular origins of the outer retinal bands in optical coherence tomography images
      5 articles also mentioned John S. Werner