A dioptre (British spelling) or diopter (American spelling), symbol dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 …

Oct 30, 2022 · A diopter is a unit that is used to calculate the focusing strength of a pair of glasses or contact lenses. It is the unit used for an optical prescription.

Dec 8, 2025 · The diopter is the standard unit of measurement used to quantify the optical power of a lens or curved mirror, which measures its ability to bend or refract light rays.

Sep 10, 2024 · A diopter is a unit of measurement for a lens’s focusing power. Learn more about what a diopter measures and how diopters vary by prescription.

Apr 4, 2024 · The basic unit of measurement in optometry, diopters, is used to express the optical power of prescription lenses. They are made expressly to gauge the way a lens bends or …

A diopter is a critical unit of measurement in optics that quantifies the refractive power of lenses used in eyeglasses and contact lenses. It indicates the degree to which a lens must bend light …

diopter, in optics, unit of magnifying power of a lens or lens system. Because the power of a lens is proportional to unity (one) divided by the focal length (see lens), the power of a lens in …

A diopter is the unit of measurement used to describe the optical power of a lens. A diopter shows what level of lens curve is required to aim light satisfactorily to your retina.

Sep 19, 2025 · Specifically, one diopter is defined as the reciprocal of the focal length in meters. This means that a lens with a focal length of one meter has a power of one diopter, while a …

The meaning of DIOPTER is a unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length in meters.