Picture of Eye Anatomy Detail
The eyes are the organs that we use to see. Eyes are comprised of many components.
The cornea is the clear front portion of the eye that processes and focuses light. Laser surgery to improve vision reshapes the cornea to improve focus. The iris is the round, colored part of the eye that helps regulate the amount of light going into the eyes. The pupil is the dark spot in the center of the eye where light enters. When it's dark, the pupil dilates to allow more light in. When it's bright, the pupil contracts to allow in less light.
The retina is a layer of nerve tissue that lines the back of the eye. Light hits the area and stimulates the production of electrical impulses that are transmitted to the visual cortex of the brain via the optic nerve. The macula is a very small, specialized area of the retina that contains cells that are very sensitive to light. The macula is responsible for our ability to discern very fine details. The vitreous is the colorless, jelly-like material that comprises the middle of the eye.
Text Reference: University of Michigan Kellogg Eye Center: "How the Eye Works"