Diopter
Diopter is a technical term expressing optical power of lens. Diopter equals the reciprocal of meter measured focal value. For instance, focal length is 25cm (0.25cm), that is to say lens has 4 diopters.
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Diopter is a technical term expressing optical power of lens. Diopter equals the reciprocal of meter measured focal value. For instance, focal length is 25cm (0.25cm), that is to say lens has 4 diopters.
