This is a rare type of pigmentary retinopathy with few symptoms in many patients. Pigment clumps in the form of bone spicules in a paravenous distribution appear as young as 1 year of age and may be present congenitally. The pigment may begin peripherally and is often segmental but eventually progresses centrally along with chorioretinal atrophy involving the majority of the fundus. For unknown reasons, males are more severely affected than females. In one family the retinal changes were associated with hyperopia, esotropia and vitreous degeneration (cells and liquefaction). There is considerable variation in expressivity among patients and the vision and fundus pigmentation can be highly asymmetrical in the two eyes. ERG abnormalities likewise vary widely with decreased photopic responses in some individuals and complete lack of both scotopic and photopic responses in severely affected eyes. Decreased night vision is not a symptom.
This is generally considered to be a stationary condition but long term follow up reveals progression of pigmentary changes, chorioretinal atrophy and increasing constriction of the peripheral visual field. Symptoms of decreased vision may be noted as early as 3 months of age. Some patients retain vision of 20/20 or 20/30 into midlife whereas others in the first decade already have count fingers vision. Likewise the size of the visual field varies widely and is not correlated with age.
