phoropter


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phoropter

 [for-op´ter]
an instrument for evaluation of vision, with lenses placed on dials in a unit that is positioned in front of the patient. See illustration.

phoropter

[for-op′ter]
an instrument for evaluation of vision, with lenses placed on dials in a unit that is positioned in front of the patient.

Phoropter

The instrument used to measure refractive status of the eyes. It contains many lenses which are then changed in front of the eyes while the patient is looking at an eye chart. This is when the doctor usually asks, "Which is better, one or two?"
Mentioned in: Visual Impairment

phoropter 

An instrument for measuring the ametropias, phorias and the amplitude of accommodation of the eyes. It consists of a large unit placed in front of the patient's head in which there are three rotating discs containing convex and concave spherical and cylindrical lenses, as well as occluders, Maddox rods, pinholes, Polaroids, prisms and coloured filters. An attachment on the instrument allows sets of rotary prisms and cross-cylinders to be swung in front of each sight hole (Fig. P9). Syn. refracting unit; refractor; refractor head. See Simultantest; trial case.
Fig. P9 Phoropter (Topcon)enlarge picture
Fig. P9 Phoropter (Topcon)
References in periodicals archive ?
Martin Schmidt, Moller-Wedel President, explains, "Moller-Wedel will be focusing on microsurgical products in the future so the acquisition of our Visutron 900+ by Reichert Technologies is a perfect solution to continue furthering the phoropter technology and offering a superior product line to customers.
Minus lens accommodative amplitude was determined monocularly in the phoropter for both the right and left eyes.
Both the PRA and NRA were determined in the phoropter.
The measurements are helpful to the optometrist when setting up the trial frame or the phoropter and saves time for both the optometrist and dispensing optician.
The move to phoropter heads is also increasing, with just 2% having made this investment but with 19% looking to make the change.
The use of the phoropter in presbyopic contact lens work is not helpful and should be discouraged.
Fusional reserves should be assessed at near using a prism bar or phoropter.
The clinic was equipped with the very latest instruments including auto refractors, computerised phoropters, computerised test charts, a fundus camera, OCT, corneal topography system, Optos, and video slit lamps.
Tarab Desai Eye Clinic in Jodphur, India is in need of manual phoropters and is welcoming donations from practices in the UK.
If any practices have leftover manual phoropters that they would like to contribute to the hospital, please contact Jon Baines Tours on 0207 223 5618, or email info@jonbainestours.