NDLI: The relationship between cup-to-disc ratio and estimated number of retinal ganglion cells.

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The relationship between cup-to-disc ratio and estimated number of retinal ganglion cells.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tatham, Andrew J. Weinreb, Robert N. Zangwill, Linda M. Medeiros, Felipe A. Liebmann, Jeffrey M. Girkin, Christopher A.
Description	Country affiliation: United States Author Affiliation: Tatham AJ ( Hamilton Glaucoma Center and Department of Ophthalmology, University of California-San Diego, La Jolla, CA 92093-0946, USA.)
Abstract	PURPOSE: To investigate the relationship between cup-to-disc ratio (CDR) and estimates of retinal ganglion cell (RGC) number. METHODS: This cross-sectional study included 156 healthy eyes, 53 glaucoma suspects, and 127 eyes with glaucoma. All eyes had standard automated perimetry (SAP), Cirrus SD-OCT, and stereoscopic optic disc photography within 6 months. CDR was determined from stereoscopic photographs by two or more masked graders. The number of RGCs in each eye was estimated using a published model that combines estimates of RGC number from SAP sensitivity thresholds and SD-OCT retinal nerve fiber layer measurements. RESULTS: The mean estimated RGC count was 1,063,809 in healthy eyes; 828,522 in eyes with suspected glaucoma; and 774,200 in early, 468,568 in moderate, and 218,471 in advanced glaucoma. Healthy eyes had a mean vertical CDR of 0.45 ± 0.15 vs. 0.80 ± 0.16 in glaucomatous eyes. There was good correlation between stereophotographic vertical CDR and SD-OCT vertical CDR (R(2) = 0.825; P < 0.001). The relationship between estimated RGCs and vertical CDR was best represented using a third degree polynomial regression model, including age and optic disc area, which accounted for 83.3% of the variation in estimated RGC counts. The nonlinear relationship between RGC estimates and CDRs indicated that eyes with a large CDR would require loss of large RGC numbers for a small increase in CDR. CONCLUSIONS: The relationship between estimated RGC counts and CDR suggests that assessment of change in CDR is an insensitive method for evaluation of progressive neural losses in glaucoma. Even relatively small changes in CDR may be associated with large losses of RGCs, especially in eyes with large CDRs. (ClinicalTrials.gov numbers, NCT00221923, NCT00221897.).
ISSN	01460404
e-ISSN	15525783
DOI	10.1167/iovs.12-11467
Journal	Investigative Opthalmology & Visual Science
Issue Number	5
Volume Number	54
Language	English
Publisher	Association for Research in Vision and Ophthalmology
Publisher Date	2013-05-07
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Glaucoma, Open-angle Diagnosis Nerve Fibers Pathology Optic Disk Optic Nerve Diseases Retinal Ganglion Cells Algorithms Cell Count Cross-sectional Studies Classification Ocular Hypertension Prospective Studies Tomography, Optical Coherence Visual Field Tests Multicenter Study Research Support, N.i.h., Intramural Research Support, Non-u.s. Gov't Discipline Ophthalmology
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Sensory Systems Cellular and Molecular Neuroscience

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