Slightly unequal pupil size1/9/2024 A CT-scan or a MRI may be warranted to rule out any lesions or growth in the brain that could be causing a cat’s differing pupil sizes. Tumors can sometimes cause differing pupil size, and a 13-year-old cat is at increased risk of tumors compared to a younger cat. If uveitis is present, your vet might want to run some tests for infectious diseases uveitis can sometimes have an infectious cause. Your vet may want to measure the pressure inside the eye using an instrument called a tonometer, to see if glaucoma is the cause. Treatment depends on the underlying cause. The third eyelid tends to elevate a little in the affected eye.Īlthough your cat seems unfazed by the condition, anisocoria can be a sign of a significant underlying disease a vet, or a board-certified veterinary ophthalmologist, should examine your cat promptly. Pathologic anisocoria reflects an abnormality in the. Horner’s syndrome is a condition where the innervation to the pupil is disrupted, causing the pupil in the affected eye to become smaller. Unequal pupil size, which may represent a benign physiologic variant or a manifestation of disease.The affected eye has a larger pupil and will often bulge from the eye socket. Glaucoma is a condition in which increased pressure exists inside the eye. When a dog has anisocoria, your veterinarian will. Third nerve palsy, Adie’s Tonic Pupil, and pharmacologic dilation are three common causes of big pupil problems. Glaucoma is another common cause for differing pupil size in cats. Anisocoria in dogs is the term used to describe a difference in the size of two pupils or uneven pupils.The affected eye is the one with the smaller pupil. The most common cause of different-sized pupils in cats is anterior uveitis, a type of inflammation within the eye.Many things could cause anisocoria in your cat. The term for different sized pupils is anisocoria, and this sounds like what you describe. She was licking a lot last night, but not this morning. What could be wrong with my cat’s eyes? My cat isn’t acting weird. Unequal pupils can also sometimes occur as a result of exposure to some medications or drugs that affect pupils size. If you happen to notice that your pupils are dilating to different extents at the same time it might be that you have an eye condition called anisocoria. ![]() When I came home yesterday, my 13-year-old cat had one eye that was dilated and one that was normal.
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