also: ジオプタ
noun
diopter
Unit of refractive power for lenses, used in optics and ophthalmology.
from German Dioptrie
このレンズの度数は3ジオプトリーです。
The power of this lens is 3 diopters.
Standard katakana form from German Dioptrie.
Rare variant; possibly from English diopter or an alternative German form.
Borrowed from German Dioptrie, a unit of lens refractive power.