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Special senses
| Term | Definition |
|---|---|
| Accomodation | Adjustment of the focus of the eye |
| Achromatic | Without color |
| Afterimage | Image continuing to appear in one's vision after exposure |
| Amplitude | Maximum potential increase in optical power |
| Astigmatism | Visual impairment due to irregularity in the dome shaped curvature of the front surface of the eye |
| Audiometer | Machine that evaluates hearing activity |
| Auditory | Sense of hearing |
| Cataract | Clouding of the lenses |
| Chromatic | With color |
| Cochlea | Houses the hearing receptor |
| Concave | Curved or depressed surface |
| Conduction | Ability to transmit an electrical impulse |
| Cones | Provides for color vision |
| Conjunctiva | Thin protective mucous membrane in eye |
| Constrict | Become narrow |
| Convergence | Turning to a common point from same directions |
| Convex | Rounded surface |
| Cornea | Transparent anterior portion of the eyeball |
| Cuticle | Outer layer of living tissue |
| Decibel | Measure of sound level |
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97abimor22756