diopter


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diopter

 [di-op´ter]
a unit of refractive power of lenses: the reciprocal of the focal length in meters is the refractive power in diopters. Symbol D.

di·op·ter (D),

(dī-op'tĕr),
The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters.
[G. dioptra, a leveling instrument]

diopter

/di·op·ter/ (di-op´ter) a unit for refractive power of lenses, being the reciprocal of the focal length expressed in meters; symbol D.
prism diopter  a unit of prismatic deviation, being the deflection of 1 cm. at a distance of one meter; symbol Δ.

diopter (D)

[dī·op′tər]
Etymology: Gk, dioptra, optical measuring instrument
a metric measure of the refractive power of a lens. It is equal to the reciprocal of the focal length of the lens in meters. For example, a lens with a focal length of 0.5 m has a diopter measure of 2.0 (1/0.5) and when prescribed as a corrective lens for the eye should make printed matter most clearly focused when it is held 0.5 m from the eyes.

di·op·ter

(D, Δ, δ) (dī-op'tĕr)
The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters.
[G. dioptra, a leveling instrument]

Diopter (D)

Unit describing the amount of focusing power of a lens.

diopter

a unit adopted for calibration of lenses, being the reciprocal of the focal length when expressed in meters; symbol D.
References in periodicals archive ?
Other great features include the click diopter, staged, locking eyecups, a shoulder harness, a lifetime warranty, and weighs in at just 37.
waterproof, phase-coated, center-focus roof prisms come with a click-stop diopter ring for worry-free field use.
Unless your astigmatism is worse than about 3 diopters only medium and low powers will require correction, and then only if the eyepiece itself lacks the eye relief you need to wear glasses.
Also offered are new lens colors and shades, as well as magnifying readers with diopters of +1.
Along with relieving the eyes and headache, it gradually decreased diopters.
58 prism Diopters and 3 months the mean deviation was 5.
You're a candidate for LASIK if your eyes are healthy, you've had a stable eyeglass prescription for at least two years and your vision is within a correctable range (no more than -12 diopters for myopia and +6 diopters or less for hyperopia).
Equipped with a distortion-free magnification of 5 diopters (2.
An ESD "Add-X" lens is available that increases magnification up to 7 diopters.
Lake Forest, CA, announced the US Food and Drug Administration (FDA) has allowed the Phase II expansion of the clinical trial with its PermaVision intracorneal lens for the correction of hyperopia (farsightedness) up to +i6 diopters.