How your eye functions?
Your eye functions on much the same principle as a camera. The iris, or the coloured portion of your eye, acts as a shutter to regulate the amount of light admitted to create images in your mind. Please watch our illustration Eye Anatomy.
The cornea, the clear window over the front of your eye, and the actual lens of your eye, located behind your pupil, work together to focus the light rays from the object viewed.
The light rays focus on the retina at the back of your eye, which then transmits the picture of the object to your brain. Please watch our illustration Normal Vision.
We refer to normal vision as 20/20. Please see our video What is 20/20 Vision?