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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Cat Veterinary
Satisfied Customers: 24385
Experience:  University of California at Davis graduate veterinarian with 44 years of experience.
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My two year old Norwegian Forest cat has one eye that the

Customer Question

my two year old Norwegian Forest cat has one eye that the pupil is dialated . it just started
Submitted: 10 months ago.
Category: Cat Veterinary
Expert:  Dr. Michael Salkin replied 10 months ago.

This is called anisocoria and it has quite a few possible etiologies. The two most common causes are the leukemia (FeLV) virus and the spastic pupil syndrome - a condition unique to cats in which owners report anisocoria, which may sometimes be transient and independent of ambient light levels. Clinically, cats with this syndrome appear to be healthy, are visual, and have no ocular abnormalities beside unusual behavior of the pupils. Unfortunately, most affected cats test positive for FeLV at the initial presentation but not all which confounds the diagnosis.

Anisocoria also results from primary iridal (iris) disease - any inflammatory process causing miosis (an abnormally small pupil); and primary neurologic disorders involving cranial nerve III and Horner's syndrome.

The initial database should involve testing for FeLV and a complete ophthalmic examination including menace response, dazzle, palpebral, pupillary light, and vestibulo-ocular reflexes. Fluoroscein staining of the cornea should be performed looking for corneal trauma and intraocular pressure should be measured (the elevated pressure of glaucoma will enlarge the pupil (mydriasis) and the lowered pressures of uveitis will make the pupil smaller (miotic)).

Much of the above is beyond the capability of many generalist vets so Segan's vet may recommend referral to a board certified veterinary ophthalmologist. Please see here: www.acvo.org

Please respond with further questions or concerns if you wish.