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Eye & Vision
| Term | Definition |
|---|---|
| lacrimal gland | produces tears and released them on the anterior surface of the eyeball through several small |
| conjunctiva | membrane that lines the eyelids and outer surface of the eyeball; connects to the outer surface of the eye; secretes mucus to lubricate the eye and keep it moist |
| optic nerve | sensory nerve that sends vision impulses to the brain |
| lacrimal sac | provides passage of tears towards nasal cavity |
| nasolacrimal duct | empties tears into the nasal cavity |
| lacrimal canaliculus | drain tears from eyes medially |
| eyelid | meet at the medial and lateral corners or commissures; palpebral fissure is the space between the eyelids in an open eye; medial commissure is at the inner corner of the eyelid; lateral commissure is at the outer corner of the eyelid |
| vitreous humor | filled with a gel-like substance |
| retina | delicate two-layered; extends anteriorly to the ciliary body |
| lens | focuses the light coming in the eye; held in place by a ligament (ciliary zonule) |
| ciliary body | smooth muscle that attaches to the lens in the eye |
| aqueous humor (in anterior segment) | contains a clear watery fluid |
| tarsal glands | produce an oily secretion that lubricates the eye |
| emmetropic eye | "harmonious vision"; eye focuses images correctly on the retina; no need for corrective lenses |
| myopia | "short vision"; nearsightedness; occurs when eyeball is too long, too strong, or cornea is too curved; requires concave corrective lenses |
| cornea | transparent, central anterior portion; allows for light to pass through; repairs itself easily; only human tissue that can be transplanted w/o fear of rejection bc it has no blood vessels so the immune system can't reach it |
| hyperopia | "far vision"; farsightedness; occurs when eyeball is too short or forms a "lazy" lens; requires convex corrective lenses |
| iris | regulates amount of light entering eye; pigmented layer that gives eye color |
| choroid | a blood-rich nutritive tunic that contains a dark pigment |
| sclera | white connective tissue layer; seen anteriorly as the "white of the eye" |
| ciliary zonule | the ligament that attaches the lens to smooth muscle |
| pupil | rounded opening the iris; black part |
| eyelashes | project from the border of each eyelid |
Created by:
kajones97
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