Which part of the eye dilates and contracts?


Clear Eye Fluid The clear eye fluid sits between the lens and the front part of the eye, called the cornea. This fluid feeds the lens and keeps the eye pressure steady.

Cornea The cornea is the clear, round front part of the eye. It protects the colored part of the eye, called the iris, and helps us see clearly. Light comes into the eye through the cornea, which then bends the light as it goes through the center of the eye, called the pupil.

Eyelid Lining The eyelid has a thin clear layer called the conjunctiva. It keeps the eye wet.

Central Vision Spot The fovea is the center part of the eye where vision is clearest.

Center of Sight The macula is a small part of the back of the eye needed for clear vision. It includes the fovea.

Eye Color Area The iris is the colored part of the eye. It has tiny muscles that change the size of the black center of the eye, called the pupil. In bright light, the pupil gets smaller. In dim light, it gets bigger.

Eye Lens The lens sits behind the iris. It focuses light onto the back of the eye. The lens changes shape to focus on objects close or far away. As we get older, the lens becomes less flexible.

Nerve Path The optic nerve is a group of many nerve fibers. It sends visual messages from the eye to the brain.

Eye Opening The pupil is the black circle in the middle of the eye. Its size controls how much light enters the eye. The iris muscles can make the pupil bigger or smaller.

Back of the Eye The retina is the back part of the eye. It has cells that capture light and turn it into signals. These signals go to the brain through the optic nerve, and we see images.

White Eye Part The sclera is the white outer part of the eye.

Clear Eye Gel

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