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Diopter

A unit of measurement for the magnifying power of a lens, equal to the reciprocal of the focal length in meters. dioptric (adj. ) Containing only refractive elements (lenses and/or prisms).

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diopter
Health care; Optometry

Unit of measure for the refractive (light-bending) power of a lens; eye care practitioners use it in eyeglass and contact lens prescriptions. A negative number refers to ...

diopter
Photography; Professional photography

unit used to express the power of a lens. It is the reciprocal of the focal length expressed in meters.

diopter
Earth science; Mapping science

A unit of measurement for the magnifying power of a lens, equal to the reciprocal of the focal length in meters. dioptric (adj. ) Containing only refractive elements (lenses ...

diopter
Science; General science

A measure of the power of a lens or a prism. The diopter (also called dioptrie) is usually abbreviated D. Its dimension is a reciprocal length, and its unit is the reciprocal of ...

diopter
Eyewear; Glasses

Unit of lens refractive power, equal to the reciprocal of the lens focus length in meters.

diopter
Eyewear; Optometry; Contact lenses; Eye surgery

A unit of measure of the refractive power if a lens. A one-diopter lens will focus parallel light rays one meter from the lens and a two-diopter lens will focus one-half of a ...

subtropical
Earth science; Mapping science

Relating to the warmest region of the Temperate Zones that border on the Torrid Zone.

sky
Earth science; Mapping science

The region above and beyond the Earth, as it is seen looking up from the ground. Sky looks blue during the day and dark at night.

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Earth science; Mapping science

The most southern point of the Earth. The South Pole is the southern end of the axis on which the Earth rotates.

prime meridian
Earth science; Mapping science

The line of longitude that passes through the town of Greenwich, England, and that measures 0 degree. It is the line from which other longitude lines are measured.

planet
Earth science; Mapping science

A celestial body revolving around a sun in a nearly circular orbit. This definition excludes comets, which have highly elliptical orbits. However, it may also exclude some of ...

area of error
Earth science; Mapping science

A figure within which the true location of a point whose location has been determined by measurement is believed to lie, with stated degree of probability.

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