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Progressive bifocal chorioretinal dystrophy (PBCRA) is an inherited condition of the eye characterized by a large wasted region of the macula, lesions in the area of the retina closest to the nose (the nasal retina), nystagmus (fast, uncontrollable movements of the eyes), myopia (nearsightedness), poor vision, and slow disease progression.[5834][5835] Widespread abnormalities of rod and cone function has been described.[5835] PBCRA is caused by mutations in a gene which has mapped to a region on chromosome 6q, close to the macular dystrophy retinal 1 (MCDR1) locus. It is inherited in an autosomal dominant fashion.[5834] To date, there is no effective treatment for this condition.[5836]
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