Definition of Diopter

1. Noun. A unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists.

Exact synonyms: Dioptre
Generic synonyms: Unit, Unit Of Measurement

Definition of Diopter

1. n. An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

Definition of Diopter

1. a measure of refractive power [n -S] : DIOPTRAL [adj]

Medical Definition of Diopter

1. An optical unit representing the reciprocal of the focal length (in metres) of a lens, in terms of the metre. A 1 diopter lens has a focal length of 1 metre, a 2-diopter lens has a focal length of 1/2 metre, etc. The diopter expresses the power as in spectacles or other weak lenses. (05 Aug 1998)

Lexicographical Neighbors of Diopter

Dionysian
Dionysius
Dionysius the Elder
Dionysus
dioon
diophantine
Diophantus
diopside
diopside
diopsides
diopsidic
dioptase
dioptase
dioptases
diopter (current term)
diopter (current term)
diopters
dioptra
dioptral
dioptre
dioptre
dioptres
dioptric
dioptric
dioptrical
dioptrics
dioptrics
dioptric aberration
dioptry
Dior

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