Snails probably don’t see well, and they do not hear at all, so it is arguable that smell is their most important sense.

Do snails have good eyesight?

Snails have very poor vision. Even though they have a lens on their eye, they have no muscles to focus the images. They can sense light and dark and work out where the light source is. They cannot see colour.

Can snails see humans?

Do snails recognize humans? Snails have very bad eyesight so they won’t recognize you by sight. But, their sense of smell is quite good and they will begin to recognize how you smell.