Q: What can you tell me about feline vision? I’ve heard that cats see well in the dark, but I still think we should leave a nightlight on so our cats can find their way to water bowls and litter boxes in the dark. My partner disagrees. A: I’m with you: We’ve placed night lights in strategic locations for our pets, too. Still, your partner’s position is valid, because cats actually do see much better at night than humans. While cats can’t see in pitch-black conditions, they can detect light that is six times dimmer than what humans can see. Several remarkable features of the feline eye give cats superior night vision. To start with, their corneas are large, and their pupils can open up wide to let in all available light. This light hits the retina, which contains three times more rods than the human retina. Rods are photoreceptors …