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23 Cards in this Set
- Front
- Back
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 |
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anterior chamber |
Area behind the cornea and in front of the lens and iris. It cotains aqueous humor |
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aqueous humor |
Fluid produced by the ciliary body and found in the anterior chamber |
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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 |
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choroid |
Middle,vascular layer of the eye, between the retina and the sclera |
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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 |
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cone |
Photoreceptor cell in the retina that transforms light energy into a nerve impulse. Cones are responsible for color and central vision. |
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conjuctiva |
Delicate membrane lining the eyelids and covering the anterior eyeball |
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cornea |
Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball |
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fovea centralis |
Tiny pit or depression in the retina that is the region of the clearest vision |
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fundus of the eye |
Posterior,inner part of the eye |
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iris |
Colored portion of the eye |
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lens |
Transparent,biconvex body behind the pupil of the eye. It bends (refracts)light rays to bring them into focus on the retina |
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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 |
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optic chiasm |
Point at which the fibers of the optic nerve cross the brain (chaism means crossing) |
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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 |
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optic nerve |
Cranial nerve carrying impulses from the retina to the brain (cerebral cortex) |
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pupil |
Dark opening of the eye,surrounded by the iris, through which light rays pass |
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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 |
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retina |
Light-sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones) |
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rod |
Photoreceptor cell of the retina essential for vision in dim light and for peripheral vision |
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sclera |
Tough,white,outer coat of the eyeball |
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vitreous humor |
Soft,jelly like material behind the lens; helps maintain the shape of the eyeball |