Refraction

Refraction

The test performed during an eye exam to determine the eyeglass lens powers needed for optimum visual acuity. An automated refraction uses an instrument that does not require the patient to respond. A manifest refraction is the manual way to determine the best lenses, by placing various lenses in front of the patient's eyes and asking, "Which is better, lens A or lens B?"

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Part of Speech: noun
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Industry/Domain: Health care
Category: Optometry
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pantoscopic angle

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optical material

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Possibility of damage to the retina by optical radiation.

optical centre

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An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

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