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ABO VOCABULARY

TermDefinition
Deviation from a single focus of light rays emanating from one source Abberation
The ability of the eye to adjust focus for varying distances Accomadation
Descriptive of a lens capable of refracting light without creating a rainbow effect Achromatic
Visual expression of sharpness of vision Acuity
Difference in plus power between the reading and distance portions of a multifocal lens Addition
Loss of vision without any apparent diseas of the eye Amblyopia
A refractive error in which the eye, when in a state of rest, does not focus the image of an object upon the retina; includes hyperopia, myopia, and astigmatism Ametropia
A condition in which the image of an object as seen by one eye differs so much in size or shape from that seen by the other eye that the two images cannot be fused into a single impression Aniseikonia
A condition in which the refractive error of one eye significantly differs from that of the other Anisometropia
Front cavity or compartment of the eye, located between the cornea and crystalline lens. Contains the Aqueous Humor Anterior Chamber
thinnest edge of a prism Apex
An absence of the crystalline lens of the eye Aphakia
not spherical; a lens having a number of curves with different radii Aspheric
A defect of the eye, of a lens or of an image formed by either. The curvature of the refracting surface or surfaces being different in different planes. This results in the focal lengths also being different in different planes Astigmatism
The meridian of cylinder power in a spherocylinder lens Axis
Thickest edge of a prism Base
The curve used as a base of a series of powers; the degree of curvature of the front surface of a lens Base Curve
A group of parallel rays of light Beam
Pertaining to vision with both eyes Binocular
Instrument used to measure thickness, calibrated in fifths and tenths of a millimeter Caliper
The angle at either end of the slit between the eyelids Canthus
A condition when the crystalline lens of the eye becomes opaque Cataract
One, which originates at birth Congenital Cataract
The lens has become either solid and shrunken or soft and liquid Hyper-mature Cataract
Any cataract in its early stages incipient Cataract
The lens is completely opaque Mature Cataract
A hard opacity of the lens occurring in the aged Senile Cataract
Cataract following an injury Traumatic Cataract
Vasculair layer of the eye; its function is to nourish the other parts of the eye, primarily the retina Choroid
Distortion of an optical image produced by the dispersion of light passing through a lens and generally characterized by blurred, multicolored edges Chromatic Abberation
The thick rim of the choroid to which the crystalline lens is attached Cilary Body
The refractive error which results in two points of focus falling behind the retina. +1.00 +2.00 x090 Compound Hyperopic Astigmatism
The refractive error which results in two points of focus falling in front of the retina -1.00-2.00x090 Compound Myopic Astigmatism
Light sensitive cells in the retina responsible for color vision, daytime vision, and the central portion of the visual field (6 million) Cones
The clear membrane that lines the eyelids and covers exposed surface of the eyeball Conjunctiva
Inflammation of conjunctiva; commonly reffered to as "pink eye" Conjunctivitis
The refractive, transparent, anterior wall of the eye, equal to 43 diopters in power. This is the fastest healing part of the body. Five. Cornea
Pure silicate glass of general excellence for the spectacle lens; index of refraction is 1.523 Crown Glass
A transparent, colorless body suspended in the front part of the eyeball, between the aqueous humor and vitreous humor. Its function is to bring light rays to focus on the retina. Crystalline Lens
Paralysis of the ciliary body Cyclopegia
Distance between the optical center placement of a lens and its geometric center; usually expressed in millimeters Decentration
The scattering of light Diffusion
Unit of measurement of the refractive power of a lens Diopter
The seeing of one object as two, due to uneven tracking of the eyes. Commonly know as double vision Diplopia
Defect in a lens which causes a straight line to appear curved Distortion
Two or more light rays proceeding outward from a point Divergent
The refractive condition of a normal eye. When the eye is at rest, the image of distant objects is brought to focus on the retina. Emmetropia
A tendency for one eye to deviate of the visual axis toward the other eye Esophopia
Actual deviation of one eye toward the visual axis of the other eye (cross eyed) Esotropia
A tendency for one eye to deviate off the visual axis away from the other eye Exotropia
Point in space which is sharply focused on the retina with the eye's accommodation relaxed Far Point
A glass of high refractive index 1.65 containing lead Flint Glass
The point to which the rays of a pencil of light converge or where they appear to diverge. In plus lenses, the focus is a real focus; in mius lenses, it is a virtual focus Focus
A small depression in the retina, at the back of the eye. It is part of the macula adapted for the clearest vision Fovea
The power of coordination by which the images received by the two eyes become a single image Fusion
Created by: mgm9480