dioptre

Noun

Meaning

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.

Source: Webster's dictionary

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Examples

Unfortunately there was insufficient dioptre adjustment for the viewfinder and also it would not auto-focus with this lens/adapter combination. Source: Internet

Oh, and the dioptre seemingly got knocked too easily too often, which saw us adjusting it a number of times over the weeks of use. Source: Internet

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