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Glossary
Accommodation:
The ability of the eye to refocus from one distance to another.
Acuity:
Clearness or sharpness of images.
Amblyopia:
Also referred to as lazy eye, loss of sight in one eye.
Astigmatism:
A misshaping of the eye that prevents light rays from coming to a single focus on the back of the eye.
Binocular:
Ability to use two eyes simultaneously to focus on the same object and to fuse two images into a single image.
Candela:
The standard unit of luminous intensity. Illumination of target slide represent in cd/m²
Cataract:
Opacity of the crystalline lens.
Color Deficiency:
Diminished ability to perceive differences in certain colors.
Contact Lens:
The thin shell of plastic which rests directly on the tear film of the cornea and corrects refractive error.
Convergence:
Turing the two eyes inward to see a nearby object.
Cornea:
The clear transparent covering on the front of the eye.
Dark Adaptation:
The process by which an eye adjusts to decreased illumination and becomes more sensitive to light.
Depth Perception:
The ability to judge distance of objects from each other or from the observer.
Diopter:
A measurement of optical power or lenses.
Diplopia:
Double vision.
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