Can crabs see very well

Answer 1

no. they mostly sense light and dark and the movement of shadows, but they are very god at detecting vibrations. That is why if you are on the beach, crabs can sense your presence by your footsteps from a long ways away and move quickly back into the water.

Answer 2

Crabs have compound eyes that can detect movement and light, but they do not have the best vision compared to other animals. Their vision is mostly used for detecting predators and finding food in their environment.