Pupil - The pupil is a black hole located in the center of the iris of the eye that allows light to strike the retina. Eye color is defined by that of the iris. Iris - In humans and most mammals and birds, the iris is a thin, annular structure in the eye, responsible for controlling the diameter and size of the pupil, thus the amount of light reaching the retina. It is secreted from the ciliary body, a structure supporting the lens of the eyeball. Aqueous humour / Aqueous body - The aqueous humour is a transparent water-like fluid similar to plasma. Ciliary body - The ciliary body is a part of the eye that includes the ciliary muscle, which controls the shape of the lens, and the ciliary epithelium, which produces the aqueous humor. The fovea is responsible for sharp central vision, which is necessary in for activities for which visual detail is of primary importance, such as reading and driving. It is located in the center of the macula lutea of the retina. Fovea centralis - The fovea centralis is a small, central pit composed of closely packed cones in the eye. The optics of the eye create a focused two-dimensional image of the visual world on the retina, which translates that image into electrical neural impulses to the brain to create visual perception. Retina - The retina is the innermost, light-sensitive layer of tissue of the eye. Choroid / Choroidea - Choroidea is the vascular layer of the eye, containing connective tissues, and lying between the retina and the sclera. Sclera - The sclera, also known as the white of the eye is the opaque, fibrous, protective, outer layer of the human eye containing mainly collagen and some crucial elastic fiber.

Cornea - The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.

The eye is part of the sensory nervous system. Eyes signal information which is used by the brain to elicit the perception of color, shape, depth, movement, and other features. Rod and cone cells in the retina are photoreceptive cells which are able to detect visible light and convey this information to the brain. The human eye is a sense organ that reacts to light and allows vision.

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