FastCounter by LinkExchange
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accommodation - The ability of the eye to change its focus from far to near objects by changing the shape of the lens anterior chamber - The space in front of the iris and behind the cornea that is filled with aqueous humor aqueous humor - Clear, watery fluid that flows between and nourishes the lens
and the cornea astigmatism - A condition in which the surface of the cornea is not spherical causing a blurred image to fall on the retina blind spot - (1) A small area of the retina where the optic nerve enters the eye; occurs normally in all eyes. choroid - The layer filled with blood vessels that nourishes the retina ciliary muscle - The muscles that relax the zonules (fibers that attach to the lens) to enable the lens to change shape for focusing cones - One type of specialized light-sensitive cells (photoreceptors) in the retina that provide sharp central vision and color vision conjunctiva - The thin, moist tissue (membrane) that lines the inner surfaces of the eyelids and the outer surface of the sclera conjunctivitis - Inflammation of the conjuctiva caused by bacteria, viruses, or
an allergic reaction cornea - The outer, clear, dome-like structure that covers the iris, pupil, and anterior chamber that is responsible for most of the focusing of light far sighted - see hyperopia fovea - The central part of the macula that provides the sharpest vision hyperopia - Farsightedness; ability to see distant objects more clearly than close objects iris - The colored ring of tissue suspended behind the cornea and immediately in front of the lens that controls the amount of light entering the eye by adjusting the size of the pupil lazy eye - Term used to describe an eye that is aimed in a different direction than the other, usually caused by a weak or nonworking eye muscle lens - The clear, double convex (outward curve on both sides) structure suspended between the aqueous and vitreous that helps to focus light on the retina myopia - Nearsightedness; ability to see close objects more clearly than distant objects near sighted - see myopia ophthalmologist - A physician who specializes in the branch of medicine dealing with the eye optic disc - The circular area where the nerve fibers from the retina leave the eye as the optic nerve optic nerve - The bundle of over one million nerve fibers that carry visual messages from the retina to the brain optometrist - Primary eye and vision care doctor who specializes in the diagnosis, treatment, and prevention of associated diseases and disorders of the eye and related systemic conditions pink eye - see conjunctivitis presbyopia - The gradual loss of the eye's ability to change focus (accommodation) for seeing near objects caused by the lens becoming less elastic; associated with aging; occurs in almost all people over age 40 pupil - The adjustable opening at the center of the iris that allows varying amounts of light to enter the eye retina - The light-sensitive layer of tissue that lines the back of the eyeball that sends visual messages through the optic nerve to the brain rods - One type of specialized light-sensitive cells (photoreceptors) in the retina that allow us to see objects in dim light (night vision) Schlemm's canal - The passageway for the aqueous fluid to leave the eye sclera - The tough, white, outer layer of the eyeball that protects and gives shape to the entire eyeball visual acuity - The ability to distinguish details and shapes of objects visual cortex - Back area of the brain specialized for receiving visual information and turning that information into perception of objects, motion, etc. vitreous - The transparent, colorless mass of gel-like tissue that lies behind the lens and in front of the retina
