diopter

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

古風 廃用

A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.

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The optometrist explained that a change of one diopter can significantly affect how clearly you see at a distance.

詳細

意味（1）

A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.

意味（2）

The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.

意味（3）

(photography, dated) A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".

意味（4）

(obsolete) Any lens system, such as a telescope.

意味（5）

(obsolete) A theodolite or similar surveyor’s angle measuring device.

意味（6）

(obsolete) An alidade.

意味（7）

(obsolete) A surgical speculum.

意味（8）

(obsolete) An instrument for drawing the skull by projections.

diopters （ 複数形 ）