The Journey Of Light

The journey begins when light enters the eye through the cornea. The cornea bends, refracting the incoming light, allowing it to then pass freely through the pupil. The pupil is a hole located in the center of the iris. The iris is in charge of regulating the size of the pupil as the iris itself changes in size. The size is directly dependent on how much light is traveling through the eye. The next step on this journey is through the lens. When light travels through the lens it works similar to a camera and focuses that light onto the retina. The retina is composed of what are called "cones" and "rods" which are simply named for their shapes. Once the light has reached this point, the cones and rods then send a signal to the brain which produces an image for you.