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31 Cards in this Set

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What is?

Anterior Chamber
fluid filled space between cornea and iris
aqueous humor
watery liquid secreted at the ciliary body that fills the anterior and posterior chambers of the eye and provides nourishment for the cornea, iris, and lens
choroid
vascular layer beneath the sclera that provides nourishment to outer portion of the retina
conjunctiva
mucous membrane that lines the eyelids and outer surface of the eyeball
cornea
front; transparent, anterior part of the eyeball covering the iris, pupil, and anterior chamber that functions to refract (bend) light to focus a visual image
fundus
interior surface of the eyeball including the retina, optic disc, macula, and posterior pole
iris
colored circle; colored part of the eye located behind the cornea that contracts and dilates to regulate light pasing through the pupil
lacrimal gland
gland located in the upper outer region above the eyeball that secretes tears
lacrimal duct
tubes that carry tears to the lacrimal sac
lacrimal sac
structure that collects tears before emptying into nasolacrimal duct
lens
transparent structure behind the pupil that bends and focuses light rays on the retina
nasolacrimal duct
passageway for tears from the lacrimal sac into the nose
optic nerve
nerve responsible for carrying impulses for the sense of sight from the retina to the brain
pupil
black circular opening in the center of the iris through which light passes as it enters the eye
retina
innermost layer that perceives and transmits light to the optic nerve
sclera
tough, fibrous, white outer coat extending from the cornea to the optic nerve
vitreous humor
jelly-like mass filling the inner chamber between the lens and retina that gives bulk to the eye
blepharospasm
involuntary contraction of the muscles surrounding the eye causing uncontrolled blinking and lid squeezing
diplopia
double vision
exophthalmos/exophthalmus
abnormal protrusion of one or both eyeballs
lacrimation
secretion of tears
nystagmus
involuntary, rapid oscillating movement of the eyeball
photophobia
extreme sensitivity to, and discomfort from, light
astigmatism
distorted vision caused by irregular curvature of the lens or cornea that prevents light rays from coming to a single focus on the retina
hyperopia
farsightedness; difficulty seeing close objects when light rays are focused on a point behind the retina
myopia
nearsightedness; difficulty seeing distant objects when light rays are focused on a point in front of the retina
presbyopia
impaired vision caused by old age
accommadation
ability to focus
aphakia
absence of the lens, usually after cataract extraction
blepharoptosis
drooping of the eyelid, usually caused by paralysis
cataract
opaque clouding of the lens causing decreased vision