WHAT DO FISH SEE UNDERWATER?
The lens sits inside the eye. In many fish it is almost spherical and focuses light on the retina, the light-sensitive layer at the back of the eye. To focus, it moves relative to the retina rather than changing shape as ours does.
A lens that changes shape very little does not mean that a fish necessarily sees distant objects out of focus. Clarity depends on its visual system, as well as on light and particles in the water.
FIELD OF VIEW
Eyes placed on the sides give many fish a wide field of view. Its extent varies between species, however: fish should not all be described as having 360-degree vision.
In front of the fish, both eyes may see the same area. The images they receive and the movements they detect help the fish locate its surroundings.
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