Sight is our most highly developed sense. It lets us learn different shapes,types of movement,distance,and colors. The eye is the main organ of sight. An opening in the front of the eye,the pupil,lets light through to the retina,which senes light. Millions of cells in the retina turn the light into nerve signals. These nerve signals then travel to the brain. When this process has a problem,people can become short-sighted,or blind