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23 Cards in this Set

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accomodation
Normal adjustment of the eye for seeing oblects at varying distances. The ciliary body adjusts the lens to change refraction and bring objects into focus
anterior chamber
Area behind the cornea and in front of the lens and iris. It cotains aqueous humor
aqueous humor
Fluid produced by the ciliary body and found in the anterior chamber
biconvex
Having two sides that are rounded,elevated,and curved evenly,like part of a sphere. The lens of the eye is a biconvex body
choroid
Middle,vascular layer of the eye, between the retina and the sclera
ciliary body
Structure on each side of the lens that connects the choroid and iris. It contains ciliary muscles,which control the shape of the lens,and it secretes aqueous humor
cone
Photoreceptor cell in the retina that transforms light energy into a nerve impulse. Cones are responsible for color and central vision.
conjuctiva
Delicate membrane lining the eyelids and covering the anterior eyeball
cornea
Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball
fovea centralis
Tiny pit or depression in the retina that is the region of the clearest vision
fundus of the eye
Posterior,inner part of the eye
iris
Colored portion of the eye
lens
Transparent,biconvex body behind the pupil of the eye. It bends (refracts)light rays to bring them into focus on the retina
macula
Yellowish region on the retina lateral to and slightly below the optic disc; contains the fovea centralis, which is the center depression containing only cone photoreceptors
optic chiasm
Point at which the fibers of the optic nerve cross the brain (chaism means crossing)
optic disc
Region at the back of the eye where the optic nerve meets the retina. It is the blind spot of the eye because it cotains only nerve fibers,no rods or cones, and is thus insensitive to light
optic nerve
Cranial nerve carrying impulses from the retina to the brain (cerebral cortex)
pupil
Dark opening of the eye,surrounded by the iris, through which light rays pass
refraction
Bending of light rays by the cornea,lens,and fluids of the eye to bring the rays into focus on the retina. Refract means to break
(-fract)back (-re)
retina
Light-sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones)
rod
Photoreceptor cell of the retina essential for vision in dim light and for peripheral vision
sclera
Tough,white,outer coat of the eyeball
vitreous humor
Soft,jelly like material behind the lens; helps maintain the shape of the eyeball