The congenital stationary night blindness (CSNB) is a non-progressive group of retinal disorders that is clinically and genetically heterogenous and may follow autosomal dominant, autosomal recessive, or X-linked recessive patterns of inheritance. It is characterized by night or dim light vision disturbance or delayed dark adaptation, poor visual acuity, myopia, nystagmus, strabismus, normal color vision and fundus abnormalities. Two forms of CSNB are recognized; complete CSNB1 and incomplete CSNB2. In CSNB2 disorder the b-wave responses are deficient and a-waves seem to be normal. Most CSNB2 patients do not complain of night blindness. Visual acuity is mildly to severely reduced. No treatment beyond correction of the refractive error is available but tinted lenses are sometimes used to enhance vision.