A unit employed by oculists in numbering glasses according tothe metric system; a refractive power equal to that of a glass whoseprincipal focal distance is one meter.

]]>https://definedictionarymeaning.com/topic/6261/dioptreRSS for NodeTue, 23 Jun 2026 16:32:24 GMTTue, 21 Mar 2017 18:59:20 GMT60a unit of measurement of the power of a lens , used for measuring a persons eyesight:

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