dioptre
屈光度
di·op·tre /daɪˈɑptɚ, ˈdaɪˌɑp-/ 名詞
屈光度,屈光率單位
Di·op·tre n. Optics A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.
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