My cat has one dilated pupil and one slit. What's wrong with his eye?

Question

I TNR feral kitties and I just caught one last night that has two different size pupils. One is dilated and the other is a slit. I am taking him to the neuter clinic tomorrow, but I don't know what is wrong with his eye. I googled it, and I found 3 possible things: Anscoria, Glaucoma, and Horner's syndrome. They all said to take your cat to the vet for it. I don't know if he would let a vet handle him. Is this a big problem? Pet's info: Cat | Mixed Breed | Male

Megan, DVM, CVA · Accepted Answer

It may be from some past head trauma. Glaucoma is usually painful and I would expect him to be squinting. Horner's usually causes a droopy eyelid and sometimes that side of the face isn't normal and sometimes also droopy. If he isn't squinting and seems to be okay, then I wouldn't be too concerned especially since he is a stray and treating him may be nearly impossible. It would be best if the vet can take a look at it while under anesthesia to ensure there isn't any major trauma to the eye or a corneal ulcer. Being that it is a spay/neuter clinic, they may not be able to do much but they could recommend if you need to take it to another clinic to have it looked at again. I hope this helps!

My cat has one dilated pupil and one slit. What's wrong with his eye?

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