Meaning of "focometer" in the English dictionary

PRONUNCIATION OF FOCOMETER

focometer  [fəʊˈkɒmɪtə]

GRAMMATICAL CATEGORY OF FOCOMETER

Focometer is a noun.

A noun is a type of word the meaning of which determines reality. Nouns provide the names for all things: people, objects, sensations, feelings, etc.

WHAT DOES FOCOMETER MEAN IN ENGLISH?

Focometer

A focometer is an instrument that measures refractive errors and is intended to provide rural or economically disadvantaged populations spherical eyeglass prescriptions without the need for complicated protocols, expensive equipment, or electricity. The focometer is monocular and hand-held, and is normally used in natural lighting. Patients rotate a collar on the focometer until the best focus is achieved. The individual's refractive power is then read off a linear dioptre scale. The focometer was developed by Drs. Ian Berger and Larry Spitzberg at the University of Houston College of Optometry in Houston, Texas, to provide a simple, inexpensive means for measuring refractive error in human vision. The portable, hand-held instrument is highly appropriate for use in remote and poor areas. Focometers measure spherical refractive errors. Astigmatism can also be measured using a "clock target" with the device. A study has found, however, that the focometer is less effective for identifying astigmatism than an autorefractor, and that its axis accuracy is limited to 15°.

Definition of focometer in the English dictionary

The definition of focometer in the dictionary is an instrument for measuring the focal length of a lens.

TRANSLATION OF FOCOMETER

Find out the translation of focometer to 25 languages with our English multilingual translator.

The translations of focometer from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «focometer» in English.

• Translator English - Chinese: focometer
• Translator English - Spanish: focómetro
• English: focometer
• Translator English - Hindi: focometer
• Translator English - Arabic: focometer
• Translator English - Russian: focometer
• Translator English - Portuguese: focometer
• Translator English - Bengali: focometer
• Translator English - French: focomètre
• Translator English - Malay: Focometer
• Translator English - German: focometer
• Translator English - Japanese: 焦点距離測定器
• Translator English - Korean: focometer
• Translator English - Javanese: Focometer
• Translator English - Vietnamese: focometer
• Translator English - Tamil: focometer
• Translator English - Marathi: केंद्रबिंदू
• Translator English - Turkish: focometer
• Translator English - Italian: focometer
• Translator English - Polish: focometer
• Translator English - Ukrainian: focometer
• Translator English - Romanian: focometer
• Translator English - Greek: focometer
• Translator English - Afrikaans: focometer
• Translator English - Swedish: focometer
• Translator English - Norwegian: focometer

10 ENGLISH BOOKS RELATING TO «FOCOMETER»

Discover the use of focometer in the following bibliographical selection. Books relating to focometer and brief extracts from same to provide context of its use in English literature.

Eye Diseases: Advances in Research and Treatment: 2011 Edition

from Boston, MA (mean age, 24.3 y +/- 1.5) and 50 from Nicaragua (mean age, 40 y +/- 13.7) were recruited. (performed on right eye only) included (1) AdSpecs, adjustable spectacles; ( 2) Focometer, focusable telescope; (3) Predetermined ...

‎2012

The Rotarian

—A.R. PARSONS, Rotarian, and MARJORIE PARSONS Monticello, Illinois, U.S.A. "Focometer" a real find Volunteers of Vision in Mexico [May] really produced results for our 3-H (Health, Hunger, and Humanity program) project. We received ...

‎

Step by Step Innovations in Presbyopia Management with ...

Subjective Focometer-induced Accommodation — A focometer is a monocular Badal optometer similar to a handheld telescope. A manual focusing ring allows the spherical optical power to be increased or decreased; but unlike the stepwise  ...

Garg, 2006

Mastering the Techniques of Presbyopia Surgery

Problems with this method include difference in blur interpretation or task interpretation by subject from one occasion to the next.10 3. Subjective Focometer — Induced Accommodation — A focometer is a monocular Badal optometer similar to ...

‎2006

Encyclopedia of Nineteenth-Century Photography

The origins of this third 'Focimeter' can be traced back to Thomas R Dallmeyer's ' Focometer' which was an optical test bench designed to ascertain lens focal length and check the extent to which aberrations had been corrected. It is unclear  ...

John Hannavy, 2013

Soviet Journal of Optical Technology

INSTRUMENTS The F-1 focometer M. V. Dorofeeva, O. A. Klochkova, Yu. G. Kozhevnikov, Yu. P. Kontievskii, and A. A. Kholopova (Submitted August 15, 1978) Opt. Mekh. Promst. 46, 17-18 (July 1979) An instrument is described for measuring ...

Low vision care

Where the lens power to be measured is beyond the range of the focometer, the lens to be measured is placed in the instrument and the auxiliary concave lenses placed in contact with the exposed surface. A simple method of determining the ...

Edwin B. Mehr, Allan N. Freid, 1975

Royal Society of London Cataloogue of Scienctific Papers ...

C. B. 42 (1856) 960-. focometer, universal. Weiss, G. Par. S. Ps. Se. (1895) 35-. Fraunhofer. Merz, S. von. Munch. Ak. Sb. 28 (1899) 75-. microscope, measurement of magnifying power. Marshall, W. P. Midi. Ntlist. 10 (1887) 226-. of precision, ...

Scientific Credibility and Technical Standards in 19th and ...

Schematic diagram of Abbe's focometer. His method used images of two different objects, scales ruled on glass, at PI and P2 and a determination of the magnification produced by the system of those two objects to determine the focal length ...

Jed Z. Buchwald, 1996

Wilson's Photographic Magazine

(a) If it is not possible, the absolute focal length of the combination is too long to be measured by a focometer of this length. (6) If the image is smaller or larger than the scale, then we can determine the absolute focal length. In this case we ...