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- W2890031476 abstract "To determine the progression rate and the variability of rod and cone sensitivities in patients with X-linked retinitis pigmentosa (XLRP) caused by mutations in ORF15-RPGR.ORF15-RPGR-XLRP patients (n = 15) were studied prospectively over 2 years with static perimetry sampling the visual field under dark-adapted and light-adapted conditions on a 12° square grid covering 168° width and 84° height. Natural history of rod and cone sensitivity loss and test-retest variability were estimated. Data were analyzed pointwise as well as averaged across small regions of neighboring loci of approximately 80 mm2 (900 deg2) in size representing the likely extent of localized gene therapy injections.Retinal loci with mild to moderate loss of sensitivity tended to be in the mid- to far-peripheral retina in most patients. When averaged across small regions, dark-adapted rod vision progressed at an average of 2 dB per year with a coefficient of repeatability (CR) of 6.3 dB, and light-adapted cone vision with white stimulus progressed at an average of 0.9 dB per year with a CR of 3.8 dB. For an average patient enrolled in an early-phase clinical trial, significant (α = 0.05) progression would be predicted to occur with 80% power in 4.5 years for rod vision and 6.1 years for cone vision. Localization of regions in the temporal hemifield and grouping of results from multiple patients would permit trial designs of shorter duration.Measurement of rod sensitivity under dark-adapted conditions averaged across a small region showed the greatest potential for detectability of progression in the shortest period." @default.
- W2890031476 created "2018-09-27" @default.
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- W2890031476 date "2018-09-12" @default.
- W2890031476 modified "2023-10-10" @default.
- W2890031476 title "Progression in X-linked Retinitis Pigmentosa Due to<i>ORF15-RPGR</i>Mutations: Assessment of Localized Vision Changes Over 2 Years" @default.
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- W2890031476 doi "https://doi.org/10.1167/iovs.18-24931" @default.
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