Meridian

Meridian

One of a number of radially arranged imaginary lines, each of which passes through the centre of the pupil when viewing the eye head-on. Generally separated in one-degree increments, meridians are used to determine the location of the most- and least-curved sections of the cornea when prescribing lenses with cylinder power to correct astigmatism. Meridians are also used to describe the shape of corrective lenses.

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