Close-up image of a woman's eye
Anatomy of an eye
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Anatomy of an eye

Overview of a human eye
Courtesy: National Eye Institute, National Institutes of Health

Cornea – The clear outer part of the eye’s focusing system located at the front of the eye.

Fovea – The center of the macula that gives the sharpest vision.

Iris – The colored part of the eye that regulates the amount of light entering the eye.

Lens – A clear part of the eye behind the iris that helps to focus light, or an image, on the retina.

Macula – A small, sensitive area of the retina that gives central vision. It is located in the center of the retina and contains the fovea.

Optic nerve – A bundle of more than one million nerve fibers that carries visual messages from the retina to the brain.

Pupil – The opening at the center of the iris. The iris adjusts the size of the pupil and controls the amount of light that can enter the eye.

Retina – The light-sensitive tissue lining at the back of the eye. The retina converts light into electrical impulses that are sent to the brain through the optic nerve.

Vitreous gel – A clear gel that fills the inside of the eye.

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