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Eye Structures
| Term | Definition |
|---|---|
| Sclera | Outer protective layer of the eye; the white of the eye |
| Cornea | Transparent anterior part of the sclera; allows for light rays to enter the eye |
| Choroid | Middle layer of the eye; interlaced w/ many blood vessels t hat supply nutrients |
| Iris | Pigmented muscular structure that regulates amount of light entering the eye by controlling size of pupil |
| Pupil | Opening in the center of the iris |
| Lens | Lies directly behind the pupil; its function is to focus and bend light |
| Retina | Innermost layer of the eye; contains vision receptors |
| Aqueous humor | Watery liquid found in anterior cavity of the eye; provides nourishment to nearby structures; maintains shape in the anterior part of the eye |
| Vitreous humor | Jellylike substance found behind the lens in the posterior cavity of the eye that maintains its shape |
| Meibomian glands | Oil glands found in the upper and lower edges of the eyelids that help lubricate the eye |
| Lacrimal glands and ducts | Produce and drain tears |
| Optic nerve | Carries visual impulses from the retina to the brain |
| Conjunctiva | Mucous membrane lining the eyelids and covering the anterior portion of the sclera |