why do sheep, snakes and some other animals have slit pupils? How does this change the image created on the retina?

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why do sheep, snakes and some other animals have slit pupils? How does this change the image created on the retina?

In: Biology

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.

A vertical view is best for gauging distances along the ground, a useful ability when you’re lurking in the shadows and have only one shot at a mouse.

A horizontal shape gives prey animals a panoramic view suited to spotting predators approaching from nearly any angle

Circular pupils are generally found on animals that chase down their prey, such as cheetahs, or on taller ambush predators like lions and tigers.

From https://www.sciencemag.org/news/2015/08/video-predator-or-prey-eyes-have-it?utm_source=youtube&utm_medium=social&utm_campaign=youtube_desc_link