system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do sheep, snakes and some other animals have slit pupils? How does this change the image created on the retina?
gpt
Sheep, goats, and a few other mammals have rectangular pupils. It gives them a relatively poor depth perception, but allows them a roughly 300 degree field of vision.

Slit style eyes (seen in cats and reptiles) construct to allow for a much greater range of lighting conditions.