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


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