The role of the eyes is to collect vast amounts of visual information, which the brain turns into 3D pictures of the world around us.
Each eye has a built-in lens to give a picture of the world and a bank of sensors to record it. Human eyes can focus on anything from a close-up speck of dust to a galaxy across the universe, and work in both faint moonlight and dazzling sunshine. The lens in each eye focuses light rays together on the back of the eyeball. Receptors record the patterns of light, shade, and colours, then send them to the brain to make an image.
Three pairs of muscles control the movements of each eye, allowing it to swivel and roll to look up, down, or from side to side. The muscles are fast-acting, so the eye can easily follow a moving object.
Picture Credit : Google