Night blindness can be congenital. Vitamin A deficiency is associated with some systemic disorders Cong is Oguchi's disease, this condition is characterized by Cong night blindness with greyish white discolouration of the macula.

Vitamin A deficiency can cause night blindness. Other disorders : Retinitis pigmentosa r p sine pigmentosa r p albicans LMB syndrome LBBB syndrome Usher's syndrome Refsm's syndrome