Phoropter

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.

Typically, the patient sits behind the phoropter, and looks through it at an eye chart placed at optical infinity (20 feet or 6 metres), then at near (16 inches or 40 centimetres) for individuals needing reading glasses. The eye care professional then changes lenses and other settings, while asking the patient for subjective feedback on which settings gave the best vision. Sometimes the habitual glasses Rx or an automated refractor is used to provide initial settings for the phoropter, and sometimes a retinoscope is used through the phoropter to measure the vision without the patient having to speak, which is useful for babies and people who don't speak the language of the practitioner.

Phoropters can also measure Heterophorias (natural resting position of the eyes), accommodative amplitudes, accommodative leads/lags, accommodative posture, horizontal and vertical vergences, and more.

The major components of the phoropter are the battery of spherical and cylindrical lenses, auxiliary devices such as Maddox rods, filtered lenses, prisms, and the JCC (Jackson Cross-Cylinder) used for astigmatism measurement. The prismatic lenses are used to analyze binocular vision and treat orthoptic problems.

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