| refraction of eye |
The refraction brought about by the refractive media of the eye (cornea, aqueous humor, crystalline lens, vitreous body). SYN: ocular refraction .
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| refractive media |
The structures of the eye that deflect light: the cornea, aqueous, crystalline lens, and vitreous.
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| refractive power |
The degree to which a transparent body deflects a ray of light from a straight path. SEE: diopter.
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| refractory period, absolute |
The brief period during depolarization of a neuron or muscle fiber when the cell does not respond to any stimulus, no matter how strong.
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| refractory period, relative |
The brief period during repolarization of a neuron or muscle fiber when excitability is depressed. If stimulated, the cell may respond, but a stronger than usual stimulus is required.
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