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Congenital stationary night blindness

Disease definition

Congenital stationary night blindness (CSNB) refers to a non-progressive group of retinal disorders characterized by night or dim light vision disturbance or delayed dark adaptation, poor visual acuity (ranging from 20/30 to 20/200), myopia (ranging from low (-0.25 diopters [D] to -4.75 D) to high (≥-10.00 D)), nystagmus, strabismus, normal color vision and fundus abnormalities. Two forms of CSNB are recognized: complete and incomplete CSNB (CSNB1 and CSNB2 respectively).

ORPHA:215

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