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diopter definition | Concept | Medical Knowledge Base

Knowledge Base/Concept/diopter definition

diopter definition

The diopter is a unit of measurement used to describe how well a person sees. Farsightedness is measured in positive diopters, and nearsightedness is measured in negative diopters. Astigmatism is measured in diopters that can be either positive or negative. With diopters, the farther a measurement is from 0, the more...

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diopter definition

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Last updated: Jan 7, 2026

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