The eye is made up of different layers of tissue. It is filled with a clear jelly. Each part of the eye does an important job to help us see.
The uvea is the middle layer around the eyeball. It includes the choroid, the ciliary body and the iris. The iris is the coloured disc at the front of your eye. The uvea controls how light comes into the eyeball and helps the eye to focus. It also makes a fluid around the lens to keep your eye healthy.
The conjunctiva is a thin, clear lining that covers and protects the white, outer surface of the eye and the inside of the eyelids.