Low vision correction in retinitis pigmentosa and associated diseases

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Abstract
Retinitis pigmentosa was considered unfavorable for low vision corrections before it was recognized the term retinitis pigmentosa frequently referred to a group of diseases including Leber''s congenital amaurosis, centro-peripheral dystrophy, typical retinitis pigmentosa and Usher''s syndrome. The success rate for use of optical aids was 66% Leber''s congenital amaurosis 75% in centro-peripheral dystrophy and 95% in typical retinitis pigmentosa. The poor success rate is not due to the constricted visual field but to the combined central and peripheral visual impairment. The type of aids most commonly prescribed were spectacle corrections, bifocals, hand magnifiers and the Visolett (paperweight type magnifier). The Visolett (paperweight type magnifier) was the most suitable non-spectacle magnifier used alone or in addition to a spectacle magnifier. Telescopic spectacles were rarely of any value. The correction of these diseases consisted of a refraction and strong reading addition in 65% of the patients.

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