My brother found this article about cats' vision. I was amazed at how poorly they actually see; nothing at all like I'd supposed. It's no wonder that movement is what best catches their attention. A lot of what they are seeing is a blur, so they manage pretty well, considering. Their night vision is much brighter than ours, but I find myself feeling rather sorry for them. As for their not seeing colors brightly - that's probably just as well - I think it would just be a distraction to them.