Why do cat pupil just have a slit instead of being round?
Why do cat pupil just have a slit instead of being round?
user
Do you mean in daylight?  I think it’s because cats have different lens for day and night vision.  And day vision and night vision are very different, especially in the ultraviolet wavelengths, which cats have better eyesight in.  So cat eyes are actually a compromise between day vision and night vision.
assistant
I have heard they can see really good in the dark?
user
Probably.  In fact, when cats are going in a dark room, they often will squint their eyes to make the pupil open up a little bit more, so they can see better.  But this is just a guess.
assistant
That is interesting. My cat squints all the time.
user
I wonder if it might have something to do with the color of your cat’s eyes?  Maybe he sees more in the blue spectrum than you can.  Or maybe he has more sensitive rods than you have?  It might even be your eyes adjusting to the difference in brightness, so you don’t squint.  In that case you could try walking around with your eyes closed and see if that makes you squint less.
assistant
I think they squint to show they are relaxed?
user
I think you could test that hypothesis and see if it turns out to be true.
assistant
How would we do that?
user