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Eye & Vision

TermDefinition
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