A Phoropter

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A most common ophthalmology instrument, Phoropter is used for examining the eye and measuring its refractive errors. The results received by a phoropter are given in the form of minus (-) or plus (+) numbers that signify the power lenses required for distant vision and nearer (reading) vision, respectively. This eye instrument contains a number of lenses, which makes it easier for the practitioner to change the lens power and determine the exact power with which the person sees clearly.

Phoroptor is registered trademark, owned by Reichert Technologies
Its common name is refractor
Present version is called "Ultramatic RX Master Phoroptor"

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