![]() The capsule surrounds the lens and remains in place during cataract surgery. Tiny fibers called zonula adherens, attached to the capsule that holds the lens, keep it suspended from the eye wall. The lens changes shape to help the eye focus on nearby objects. Just behind the pupil is the crystalline lens, which focuses light toward the back of the eye. The muscles of the iris dilate (expand) or contract (narrow), altering the size of the pupil to control the amount of light reaching the back of the eye. The black hole in the center of the iris is known as the pupil. The iris is the colored part of the eye and is behind the anterior chamber. ![]() ![]() It is the vascular layer, formerly called the uvea or uveal tract, and is made up of three parts, from posterior to anterior: choroid, ciliary body, and iris. The eye constantly produces aqueous humor.Īqueous humor drains from the eye in an area known as the drainage angle to maintain constant eye pressure. Red light approaches through the domed portion at the front of the eye, known as the cornea.īehind the cornea is a fluid-filled space known as the anterior chamber. Tears drain from the eye through the tear duct. The meibomian gland produces the oil converted to another part of the tear film. The lacrimal gland, located below the outer edge of the eyebrow in the orbit, constitutes the aqueous part. Tears, responsible for lubricating the eye, comprise three layers called tear film. The conjunctiva is a transparent membrane covering the eyes and eyelids' inner surface. These muscles move the eye up, down, from side to side, and rotate it.Įach extraocular muscle connects to the white part of the eye, known as the sclera, a strong layer of tissue covering almost the entire eyeball surface. The orbit has six extraocular muscles that attach to the eye. The eye sits within a protective bony pyramid known as the orbit. This article has been medically reviewed by Maryther Oropeza, MD.
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