The Structure of the Eye

The eye is similar in structure to a camera. The cornea has the greatest refractive power and functions like a convergent lens. The pupil is a stop which can compensate for different levels of incoming light. The lens of the eye can be compared to the various lenses of a camera. The retina (light-sensitive layer) is like the film in the camera. Just as the lens objectives must bundle the rays of light on this film, so the light coming in through the cornea and the lens must fall perfectly onto the retina in order to create a sharply focused image. If this does not occur, the person has impaired vision.