The human eye is the organ of sight, allowing us to perceive shapes, colors, and light changes. It is composed of the eyeball, cornea, pupil, iris, lens, retina, and optic nerve. Light passes through the cornea and pupil, forming an inverted image on the retina. The optic nerve transmits this image to the brain, which interprets it correctly.
External structures like eyelids, eyelashes, and tear glands protect and keep the eyes moist.