I know im super late on this post, but it is important to note that cats need some light to see in the dark. They cannot see in complete absolute darkness. Though it has been said that they see 10X better in the dark than military grade night vision goggles! From learning this i keep night lights around the house especially in my basement so they can find their toys and litter pans where there are no windows or natural light coming through. Im sure they dont need nearly as much light that i provide but it makes me feel better anyway. I always used to think cats could see in complete darknee but that not true. They do need a tiny bit of light, say moon light haha. Okay im a crazy cat lady i know