The human eye belongs to a general group of eyes found in nature called "camera-type eyes." Instead of film, the human eye focuses light onto a light sensitive membrane called the retina.
The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light. Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye.
