A number of conditions may cause a patient to see better in dim light than in bright light (day blindness, hemeralopia).
Acquired causes of day blindness:
(1) Adie pupil
(3) acquired aniridia
(4) cataracts
(5) central scotoma
(6) intraocular iron
(7) partial occlusion of the retinal artery
Congenital or hereditary causes of day blindness:
(1) albinism
(2) phytanic acid oxidase deficiency (Refsum’s disease)
(3) total color blindness
(4) hereditary retinoschisis
(5) congenital, as an autosomal recessive trait with color blindness and amblyopia
(6) congenital aniridia
