Journal
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
Volume 59, Issue 8, Pages 3385-3393Publisher
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/iovs.17-23708
Keywords
adaptive optics; visual acuity; cone photoreceptors; inherited retinal degeneration
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Funding
- National Institutes of Health (NIH) [EY023591, EY002162]
- Food and Drug Administration [R01-41001]
- Foundation Fighting Blindness
- Research to Prevent Blindness Nelson Trust Award for Retinitis Pigmentosa and Unrestricted Funds
- The Bernard A. Newcomb Macular Degeneration Fund
- That Man May See, Inc.
- Hope for Vision
- Beckman Initiative for Macular Research Grant
- Claire Giannini Foundation
- NIH [5T32EY007043-37]
- Minnie Flaura Turner Memorial Fund
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PURPOSE. To evaluate foveal function in patients with inherited retinal degenerations (IRD) by measuring visual acuity (VA) after correction of higher-order aberrations. METHODS. Adaptive optics scanning laser ophthalmoscopy (AOSLO) was used to image cones in 4 healthy subjects and 15 patients with IRD. The 840-nm scanning laser delivered an E optotype to measure AOSLO-mediated VA (AOSLO-VA). Cone spacing was measured at the preferred retinal locus by two independent graders and the percentage of cones below the average density of 47 age-similar healthy subjects was computed. Cone spacing was correlated with best-corrected VA measured with the Early Treatment of Diabetic Retinopathy Study protocol (ETDRS-VA), AOSLO-VA, and foveal sensitivity. RESULTS. ETDRS-VA significantly correlated with AOSLO-VA (rho = 0.79, 95% confidence interval [CI] 0.5-0.9). Cone spacing correlated with AOSLO-VA (rho = 0.54, 95% CI 0.02-0.7), and negatively correlated with ETDRS letters read (rho = -0.64, 95% CI -0.8 to -0.2). AOSLO-VA remained >= 20/20 until cones decreased to 40.2% (CI 31.1-45.5) below normal. Similarly, ETDRS-VA remained >= 20/20 until cones were 42.0% (95% CI 36.5-46.1) below normal. Cone spacing z scores negatively correlated with foveal sensitivity (rho = -0.79, 95% CI -0.9 to -0.4) and foveal sensitivity was >= 35 dB until cones were 43.1% (95% CI 39.3-46.6) below average. CONCLUSIONS. VA and foveal cone spacing were weakly correlated until cones were reduced by 40% to 43% below normal. The relationship suggests that VA is an insensitive measure of foveal cone survival; cone spacing may be a more sensitive measure of cone loss.
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