Definitions for diopter
diopter

Princeton's WordNetRate this definition:5.0 / 1 vote

1. diopter, dioptrenoun

   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

WiktionaryRate this definition:5.0 / 2 votes

1. diopternoun

   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.

2. diopternoun

   Any lens system, such as a telescope.

3. diopternoun

   A theodolite or similar surveyor's angle measuring device.

4. diopternoun

   An alidade.

5. diopternoun

   A surgical speculum.

6. diopternoun

   An instrument for drawing the skull by projections.

WikipediaRate this definition:0.0 / 0 votes

1. diopter

   A dioptre (British spelling) or diopter (American spelling) is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dioptre = 1 m−1. It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres. For example, a 3-dioptre lens brings parallel rays of light to focus at 1⁄3 metre. A flat window has an optical power of zero dioptres, as it does not cause light to converge or diverge. Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. The main benefit of using optical power rather than focal length is that the thin lens formula has the object distance, image distance, and focal length all as reciprocals. Additionally, when relatively thin lenses are placed close together their powers approximately add. Thus, a thin 2.0-dioptre lens placed close to a thin 0.5-dioptre lens yields almost the same focal length as a single 2.5-dioptre lens. Though the dioptre is based on the SI-metric system, it has not been included in the standard, so that there is no international name or symbol for this unit of measurement—within the international system of units, this unit for optical power would need to be specified explicitly as the inverse metre (m−1). However most languages have borrowed the original name and some national standardization bodies like DIN specify a unit name (dioptrie, dioptria, etc.) and unit symbol dpt. In vision care the symbol D is frequently used. The idea of numbering lenses based on the reciprocal of their focal length in metres was first suggested by Albrecht Nagel in 1866. The term dioptre was proposed by French ophthalmologist Ferdinand Monoyer in 1872, based on earlier use of the term dioptrice by Johannes Kepler.

ChatGPTRate this definition:0.0 / 0 votes

1. diopter

   A diopter is a unit of measurement used in optics that denotes the refractive power of a lens or mirror. It indicates the reciprocal of the focal length measured in meters. The higher the diopters, the higher the magnification or power of the lens. This term is commonly used in optometry for determining the strength of corrective lenses needed by individuals with vision problems.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Diopternoun

   alt. of Dioptra

Matched Categories

1. • Unit Of Measurement

Usage in printed sourcesFrom: 

1. [["1742","2"],["1766","1"],["1787","1"],["1811","1"],["1813","1"],["1818","1"],["1819","2"],["1820","1"],["1822","1"],["1823","1"],["1827","1"],["1829","2"],["1830","1"],["1833","1"],["1835","1"],["1838","2"],["1839","1"],["1840","2"],["1843","1"],["1845","1"],["1850","2"],["1851","25"],["1852","20"],["1854","1"],["1855","1"],["1856","4"],["1857","1"],["1858","10"],["1859","4"],["1861","2"],["1862","7"],["1863","1"],["1864","12"],["1865","3"],["1866","3"],["1867","2"],["1868","2"],["1869","4"],["1870","2"],["1871","6"],["1872","5"],["1873","7"],["1876","4"],["1877","4"],["1878","5"],["1880","2"],["1881","2"],["1882","34"],["1883","3"],["1884","5"],["1885","2"],["1886","2"],["1887","9"],["1888","1"],["1889","6"],["1890","4"],["1891","20"],["1892","7"],["1893","146"],["1894","135"],["1895","62"],["1896","21"],["1897","72"],["1898","93"],["1899","284"],["1900","387"],["1901","117"],["1902","63"],["1903","323"],["1904","134"],["1905","102"],["1906","210"],["1907","162"],["1908","31"],["1909","131"],["1910","150"],["1911","212"],["1912","78"],["1913","123"],["1914","909"],["1915","27"],["1916","311"],["1917","104"],["1918","112"],["1919","98"],["1920","207"],["1921","142"],["1922","261"],["1923","127"],["1924","87"],["1925","118"],["1926","49"],["1927","143"],["1928","109"],["1929","21"],["1930","160"],["1931","104"],["1932","125"],["1933","29"],["1934","87"],["1935","79"],["1936","121"],["1937","163"],["1938","133"],["1939","143"],["1940","87"],["1941","96"],["1942","114"],["1943","86"],["1944","129"],["1945","117"],["1946","96"],["1947","244"],["1948","288"],["1949","211"],["1950","188"],["1951","82"],["1952","374"],["1953","204"],["1954","128"],["1955","95"],["1956","105"],["1957","195"],["1958","154"],["1959","187"],["1960","72"],["1961","427"],["1962","260"],["1963","225"],["1964","225"],["1965","448"],["1966","290"],["1967","435"],["1968","422"],["1969","454"],["1970","431"],["1971","466"],["1972","325"],["1973","416"],["1974","489"],["1975","298"],["1976","558"],["1977","450"],["1978","343"],["1979","301"],["1980","446"],["1981","357"],["1982","361"],["1983","725"],["1984","685"],["1985","476"],["1986","431"],["1987","829"],["1988","619"],["1989","587"],["1990","556"],["1991","468"],["1992","488"],["1993","385"],["1994","611"],["1995","707"],["1996","1068"],["1997","896"],["1998","568"],["1999","910"],["2000","1222"],["2001","932"],["2002","875"],["2003","1095"],["2004","920"],["2005","1000"],["2006","1003"],["2007","771"],["2008","980"]]

Anagrams for diopter »

1. peridot

2. proetid

3. proteid

4. protide

5. dioptre

6. pteroid

How to pronounce diopter?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say diopter in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of diopter in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of diopter in Pythagorean Numerology is: 6

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=diopter
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Diopter
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Diopter
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/diopter
6. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=diopter