phoropter
Sign in to savethumb|right|A phoropter can measure refractive error to determine an individual's spectacle lens prescription during an eye examination. thumb|right|Side of a phoropter that faces the patient
~14 min read
Encyclopedic overview
9 sectionsContents
- Operation
- Trademark and origin of the term
- History
- Shigon/Woolf/Genothalmic/Shuron/BRU
- DeZeng/American Optical/Reichert
- Greens'/Bausch and Lomb
- Europe and Asia
- See also
- References
thumb|right|A phoropter can measure refractive error to determine an individual's spectacle lens prescription during an eye examination. thumb|right|Side of a phoropter that faces the patient
A phoropter or refractor is an ophthalmic testing device. It is commonly used by eye care professionals during an eye examination, and contains different lenses used for refraction of the eye during sight testing, to measure an individual's refractive error and determine their eyeglass prescription. It also is used to measure the patient's phorias and ductions, which are characteristics of binocularity.
Excerpted from Wikipedia’s “phoropter” article, available under the CC BY-SA 4.0 licence.