The eye is a visual organ that performs the function of observing, seeing, and receiving images and colors of objects and transferring them to the brain for processing and storage. In particular, the pupil and cornea are among the important parts to ensure the function of vision.

To convert light reflected from an object into an image, it must go through many complex stages: Light must pass through many layers of the eye's structure, converge on the retina, and be converted into electrical signals along the optic nerve to the visual center behind the brain.