<unk>  is known to occur in several ocular conditions. Cone dystrophy and achromatopsia, affecting the cones in the retina, and the anti-epileptic drug trimethadione are typical causes. Adie's pupil, which fails to constrict in response to light; aniridia, which is absence of the iris; and albinism, where the iris is defectively pigmented, may also cause this. Central cataracts, due to the lens clouding, disperses the light before it can reach the retina and is a common cause of<unk>  and photoaversion in the elderly. Cancer-associated retinopathy (CAR), seen when certain cancers incite the production of deleterious antibodies against retinal components, may cause<unk> . Another known cause is a rare genetic condition called Cohen syndrome (aka Pepper syndrome). Cohen syndrome is mostly characterized by obesity, mental retardation and craniofacial dysmorphism due to genetic mutation at locus 8q22–23. Rarely, it may have ocular complications such as<unk> , pigmentary chorioretinitis, optic atrophy or retinal/iris coloboma, having a serious effect on the person's vision. Yet another cause of<unk>  is uni- or bilateral postchiasmatic brain injury. This may also cause concomitant nyctalopia.
Hemeralopia
Nyctalopia
Myopia
Cyclopia
Ocular dysmetria
Amblyopia
Pseudomyopia
Tunnel vision