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Why is my cat's eye shining strangely in daylight and squinting?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 4 years old | 6 lbs

Hello, my cat, 4 y.o., developed something strange to the left eye: it is shining bizarrely- it's like the known tapetum lucidum reflection effect, but in normal daylight conditions. He is also squinting a bit. No or very little pain (very little avoidance of touch), pupillary reflex is normal, no anisocoria seems to be present. Yesterday he was normal. Can you please indicate probable diagnosis and proper course of action? Thank you in advance!

1 Answer

Most Helpful Answer

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Answered By Makenzie Kurth, DVM

Veterinarian

Published on January 30th, 2018

It is difficult to say without a picture, if not an eye exam. Tapetal reflection can be seen during daylight depending on where you and Tomita are in relation to a light source. If this is the case, the eye could be normal. If the shining is in the anterior chamber, this could be uveitis, a problem with the iris, a lipid Deposit, or other. The fact that the eye is visual and comfortable is a great sign but a good eye exam (with a veterinary ophthalmologist if it is very unusual) is a good idea.

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