Your eye is a magical organ that allows us to see the world. There are several different parts to your eye. The part of your eye that is colored green, blue, brown, black or hazel is called the iris. Right in the middle of the iris is a hole. This hole looks like a black circle and it is called the pupil. It is protected by a clear layer called the cornea. Behind the pupil is a lens. 

   In order to for see light enters your eye and goes through the cornea, the pupil and the lens. The image appears upside-down on the very back part of the eye which is called the retina. 

   The retina has millions and millions of tiny cells called cones. These cones are able to tell us about all the different colors that we see. Another type of cell, called rods, tell us about black and white things that we see. 

   Using the optic nerve the receptor cells send messages to the brain. There is a blind spot on the retina where the nerves leave the eye because there are no rods or cones there.