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Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Term
Definition
Accomodation   Adjustment of the focus of the eye  
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Achromatic   Without color  
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Afterimage   Image continuing to appear in one's vision after exposure  
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Amplitude   Maximum potential increase in optical power  
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Astigmatism   Visual impairment due to irregularity in the dome shaped curvature of the front surface of the eye  
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Audiometer   Machine that evaluates hearing activity  
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Auditory   Sense of hearing  
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Cataract   Clouding of the lenses  
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Chromatic   With color  
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Cochlea   Houses the hearing receptor  
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Concave   Curved or depressed surface  
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Conduction   Ability to transmit an electrical impulse  
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Cones   Provides for color vision  
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Conjunctiva   Thin protective mucous membrane in eye  
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Constrict   Become narrow  
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Convergence   Turning to a common point from same directions  
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Convex   Rounded surface  
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Cornea   Transparent anterior portion of the eyeball  
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Cuticle   Outer layer of living tissue  
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Decibel   Measure of sound level  
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