Lexic.us

Definition of Diopter

1. Noun. A unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists.

Definition of Diopter

1. n. An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.

Definition of Diopter

1. Noun. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters. ¹

2. Noun. (obsolete) Any lens system, such as a telescope. ¹

3. Noun. (obsolete) A theodolite or similar surveyor’s angle measuring device. ¹

4. Noun. (obsolete) An alidade. ¹

5. Noun. (obsolete) A surgical speculum. ¹

6. Noun. (obsolete) An instrument for drawing the skull by projections. ¹

¹ Source: wiktionary.com

Definition of Diopter

1. a measure of refractive power [n -S] : DIOPTRAL [adj]

Medical Definition of Diopter

1. An optical unit representing the reciprocal of the focal length (in metres) of a lens, in terms of the metre. A 1 diopter lens has a focal length of 1 metre, a 2-diopter lens has a focal length of 1/2 metre, etc. The diopter expresses the power as in spectacles or other weak lenses. (05 Aug 1998)

Lexicographical Neighbors of Diopter

Literary usage of Diopter

Below you will find example usage of this term as found in modern and/or classical literature:

1. Optic Projection, Principles, Installation, and Use of the Magic Lantern by Simon Henry Gage, Henry Phelps Gage (1914)
"diopter lens gives a smaller image than the 4 diopter lens (see also fig. ... A Image of a 3 diopter left eye and a 4 diopter right eye; the 4 diopter eye ..."

2. Retinoscopy (or Shadow Test) in the Determination of Refractions at One by James Thorington (1906)
"BAND OF LIGHT SHOWING HALF A diopter OF ASTIGMATISM. meridian, if the myopia is less than one diopter, moves with the mirror, and against the movement of ..."

3. Diseases of the eye by George Edmund De Schweinitz (1916)
"... given in English inches, as it is customary to compare the French lenses with the diopters by their focal length in English inches. A lens of 1 diopter ..."

4. Refraction and how to refract by James Thorington (1900)
"... and Prentice's method, known as the prism-diopter. FIG. 18. Dennett's Method (Fig. 19). ... diopter."

5. The Diseases of Children: A Work for the Practising Physician by Meinhard von Pfaundler, Arthur Schlossmann (1912)
"diopter, a part of Lange's drawing apparatus. fully examined. Irregularity of the waist triangle lines always indicates a scoliosis of the lumbar region, ..."

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