Anatomy of an eye | How the eye works? |
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Anatomy of an eyeCornea : The cornea is a transparent tissue on the surface of the eye. It is a curved spherical structure that provides most of the focusing power when light enters the eye. Contact lenses sit on top of the cornea to change its curvature and eliminate the need for glasses.Epithelium: The thin outer layer of the cornea that is the eyes protective layer and can heal very quickly when disturbed. Iris: The iris is the colored part of the eye. The primary function of the iris is to control the size of the pupil. Pupil: The pupil is the black spot in the center of the iris. The primary function of the pupil is to control the amount of light entering the eye. In a bright environment the pupil becomes smaller to allow less light to pass through. In a dark environment the pupil expands t allow more light to reach the back of the eye. Lens: The lens is the clear structure located behind the pupil. The primary function of the lens is to provide fine-tuning for focusing and reading which is accomplished by altering its shape. Retina: The retina is a thin film of tissue where images are brought into focus. It consists of fine nerve tissue that line the inside wall of the eye and acts like the film in a camera. Its primary function is to capture and transmit images. Vitreous Gel: This is the clear "gel-like substance which fill the inside of the eyeball. Light passes through the vitreous on its way to being focused on the retina. Sclera: This is the "white part" of the eye. Its purpose is to provide structure, strength, and protection for the eye. |