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 m −1.

Oct 30, 2022 · What is a diopter? A diopter is a unit used to calculate the focusing strength of a pair of glasses or contact lenses. And it is the measurement unit for an optical prescription. If you know the power of a lens in diopters, taking the inverse will give you the focal length — the distance where light is focused.. What does a diopter mean?

A dioptre (uk), or diopter (us), is a unit of measurement of the optical powerof a lens or curved mirror, which is equal to the reciprocal of the focal length measured inmetres (that is, 1/metres). It is thus a unit ofreciprocal length.

Apr 4, 2024 · Dive into the world of diopters with our comprehensive guide! Learn about optical measurement, vision correction, and more. Perfect for those seeking clarity on their vision needs.

DIOPTRE definition: a unit of measurement of the power of a lens, used for measuring a person's eyesight: . Learn more.

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 diopters is numerically equal to 1 m divided by the focal length in metres.The algebraic sign of the magnifying power indicates whether the lens causes an incident pencil of parallel light rays to ...

diopter (an optical instrument), from Middle French dioptre, from Latin dioptra, from Greek, from dia-+ opsesthai to be going to see — more at optic

Jan 24, 2024 · Break down the basics of diopters and what they mean for vision prescriptions. Understand how diopters measure the degree of myopia and hyperopia and how the strength of a lens correlates to diopter units.

dioptre A measure of lens power. The reciprocal of the focal length in metres. A lens of 1 m focal length has a power of 1 dioptre. A lens of 50 cm focal length has a power of 2 dioptres. One of 33.3 cm focal length has a power of 3 dioptres.

A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (that is, 1/metres). For example, a 3 dioptre lens brings parallel rays of light to focus at 1/3 metre.