Why do my cat's eyes dialate to round pupils instead of small slits?
My cat's eyes dilate to small round pupils instead of slits. I have never seen a house cat's eyes do that. I wondered if it had something to do with her breed. We got her from the Humane Society and she has Siamese markings but she is definitely not a full blooded Siamese.
Basically, a cat's eyes react to light in much the same way as a human's. Off course, cats can see a lot better in the dark because their pupils dilate more to allow more light into the eye.
I guess what I am trying to ask (the question above is mine) is not why her pupils dilate but why are they not shapes like all the other cats I have seen. I have never seen a house cat with round pupils. She almost looks like an owl and she never blinks. I afraid she is a mutant or an alien.
All cats do that. Your cat is not special (except to you :) in this aspect. They also dilate their pupils when they are frightened or alarmed. It gives them a chance to check out the broad scope of things. They return to narrow slits in the daylight, or when they happen to be chasing something. http://cats.about.com/cs/eyesvision/a/cats_eyes_2.htm