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OPTIC NERVE
This nerve connects the retina of each eye to the brain, to which it transmits images via nerve impulse. (see EYE) |
OPTICAL ILLUSION
A visual perception of an object, figure, distortion, etc., that does not correspond to reality. |
OPTICAL POWER
Measured in diopters, this defines the ability of a lens or contact lens to correct a visual defect. |
OPTOMETER
A device used to measure the refraction of the eye. Synonym: refractometer. |
ORBIT
The bony cavity in which the eye as a whole rests. |
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