Definition of dioptre in English:

dioptre

(US diopter)

noun dʌɪˈɒptədaɪˈɑptər

A unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens.
屈光度，折光度
vision corrected to within one dioptre of perfect sight
Example sentencesExamples
- The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism.
- Refractive error is measured in dioptres, and myopia is designated with a minus sign.
- The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive.
- For a typical 3-mm-diameter lens, the dioptric power can be controlled between - 100 and + 50 diopters.
- The focusing power of a lens is measured in dioptres.

Origin

Late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- 'through' + optos 'visible'. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century.

Rhymes

adopter

Definition of diopter in US English:

diopter

noundīˈäptərdaɪˈɑptər

A unit of refractive power that is equal to the reciprocal of the focal length (in meters) of a given lens.
屈光度，折光度
vision corrected to within one diopter of perfect sight
Example sentencesExamples
- Refractive error is measured in dioptres, and myopia is designated with a minus sign.
- The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism.
- The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive.
- The focusing power of a lens is measured in dioptres.
- For a typical 3-mm-diameter lens, the dioptric power can be controlled between - 100 and + 50 diopters.

Origin

Late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- ‘through’ + optos ‘visible’. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century.

词汇	dioptre
释义	Definition of dioptre in English: dioptre (US diopter) noun dʌɪˈɒptədaɪˈɑptər A unit of refractive power, which is equal to the reciprocal of the focal length (in metres) of a given lens. 屈光度，折光度 vision corrected to within one dioptre of perfect sight Example sentencesExamples The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism. Refractive error is measured in dioptres, and myopia is designated with a minus sign. The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive. For a typical 3-mm-diameter lens, the dioptric power can be controlled between - 100 and + 50 diopters. The focusing power of a lens is measured in dioptres. Origin Late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- 'through' + optos 'visible'. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century. Rhymes adopter Definition of diopter in US English: diopter noundīˈäptərdaɪˈɑptər A unit of refractive power that is equal to the reciprocal of the focal length (in meters) of a given lens. 屈光度，折光度 vision corrected to within one diopter of perfect sight Example sentencesExamples Refractive error is measured in dioptres, and myopia is designated with a minus sign. The difference between the focusing powers of these two axes, measured in dioptres, is the astigmatism. The presence of 1 dioptre of refractive error reduces Snellen visual acuity to less than 6/12 that is, below the level needed to drive. The focusing power of a lens is measured in dioptres. For a typical 3-mm-diameter lens, the dioptric power can be controlled between - 100 and + 50 diopters. Origin Late 16th century (originally as diopter, denoting an alidade): from French, from Latin dioptra, from Greek, from di- ‘through’ + optos ‘visible’. The term was used in the early 17th century to denote an ancient form of theodolite; the current sense dates from the late 19th century.
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