Anisocoria Causes

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 Anisocoria


Anisocoria is a condition in which the pupils of the cat's eyes are different sizes; in other words, one pupil is larger than the other one. In cats, the pupil is an elliptically-shaped opening in the middle of the iris that allows light to pass through the eye to the retina. The pupil constricts or dilates (enlarges) according to the amount of light that enters the eyes, with both pupils normally dilating in dim light and constricting in bright light.

Anisocoria is a sign of a disease of condition, therefore there can be several different causes, including:

• Corneal injury such as an ulcer

• Disease or injury to the brain or to the nerves tissues

• Glaucoma (the pupil in the affected eye will be dilated)

• Uveitis (the pupil in the affected eye will usually be constricted)

• Retinal disease

• Scar tissue formation between the iris and the lens (called posterior synechia)

• Iris atrophy (Congenital defect of the iris, in which the iris tissue does not develop properly)

• Cancer within the affected eye.

• Spastic pupil syndrome - a syndrome that may be associated with Feline infectious peritonitis or feline leukemia virus infection.

• Other infectious diseases such as feline immunodeficiency virus or toxoplasmosis.

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