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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

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