BRAIN AND OPTICAL FUNCTIONS

When a human looks at an object, light from the object enters the eyes.

The light goes through the cornea, which is a clear covering, then through the pupil which is a clear circle in the colored part of the eye called the iris.

The pupil gets larger (dilates) when there is little light and smaller when there is little light. The lens focuses the light through the aqueous humor, a clear liquid, and onto the retina. The retina, in the back of the eye, contains millions of tiny photo sensors that detect the light.

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