Definition
dioptre
noun
- A unit of measurement of the refractive power of a lens, equal to the reciprocal of the focal length in meters.
Usage: Also spelled 'diopter' in U.S. English; Commonly used in ophthalmology and optometry
Examples
- The prescription for her glasses was +2.5 dioptres in each eye.
- A lens with a focal length of one meter has a refractive power of one dioptre.
- The optometrist measured the patient's vision correction in dioptres.
- Stronger corrective lenses have higher dioptre values.
- The contact lens was prescribed at -3.0 dioptres to correct myopia.