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January 1991

Visual Acuity and Field Loss in Retinitis Pigmentosa-Reply

Author Affiliations

Baltimore, Md

Arch Ophthalmol. 1991;109(1):13-14. doi:10.1001/archopht.1991.01080010015007

In Reply.  —In the article1 discussed by Dr Marmor, we demonstrated, in 235 patients with typical RP and no evidence of visual acuity-limiting cataract or macular edema, that for patients with visual fields smaller than 30°, the prevalence of decreased visual acuity increases with the extent of further visual field loss. Specifically, until the V-4-e visual field reaches 30°, 96% of patients retained 20/40 visual acuity or better. Fewer than one third of patients with visual fields smaller than 10° radius had visual acuities of 20/40 or better and intermediate percentages of patients with 20/40 visual acuity or better were seen at intermediate visual field sizes. In other studies,2,3 we showed that visual field loss in RP, regardless of subtype, progresses at a very predictable rate, following an exponential decay function.We appreciate Dr Marmor's interest in our work and are grateful for the opportunity to clarify

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