Phoropter
（重定向自Phoroptor）
![A phoropter can measure refractive error to determine an individual's spectacle lens prescription during an eye examination.](/Images/godic/202502/02/Geraet_beim_Optiker3729.jpg")
![Side of a phoropter that faces the patient](/Images/godic/202502/02/Phoropter_at_Rodman_&_Engelstein_office_23729.jpg")
![The American Optical Ultramatic RxMaster of 1967](/Images/godic/202502/02/AO_phoropter33729.JPG")
![The first phoropters. Top, the 1917 Woolf Ski-Optometer of New York City, with cylinder.; bottom, the 1917 DeZeng Phoro-Optometer model 570, Camden, NJ. The mounting arms on both devices attached at the bottom.](/Images/godic/202502/02/1917phoroptor3729.JPG")
Phoropter is a common name for an ophthalmic testing device, also called a refractor. 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 his or her eyeglass prescription. It also is used to measure the patients' phorias and ductions, which are characteristics of binocularity.