Published on Aug 20, 2020

Abstract Eyes Background Images

License Info: Creative Commons 4.0 BY-NC

The eye is a round organ for sensing light so organisms can see. It is the first part of the visual system. About 97 percent of animals have eyes. Image-resolving eyes are present in cnidaria, molluscs, vertebrates, annelids and arthropods.

In mammals, two kinds of cells, rods and cones, allow sight by sending signals through the optic nerve to the brain.

Some animals can see light that humans cannot see. They can see ultraviolet or infrared light.


The lens on the front part of the eye acts like a camera lens. It can be pulled flatter by muscles inside the eye, or allowed to become rounder. As some people get older, they may not be as able to do this perfectly. Many people are born with other small problems or get them later in life, and they may need eyeglasses (or contact lenses) to fix the problem.

Today, ten different types of eyes are known. Most ways of capturing an image have evolved at least once.

The eyes of most land-living vertebrates (as well as those of some spiders, and insect larvae) contain a fluid that has a higher refractive index than the air. The cornea is sharply curved and refracts light towards the focus. The lens need not do all of the refracting. This lets the lens adjust the focus more easily, for much higher resolution.

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