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

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

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

      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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    5. Photoreceptor disc shedding in the living human eye

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

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

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

      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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    9. Volumetric retinal imaging with ultrahigh-resolution spectral-domain optical coherence tomography and adaptive optics using two broadband light 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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    10. 1-15 of 18 1 2 »
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  2. About Ravi S. Jonnal

    Ravi S. Jonnal

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