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

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 ?
As per the explanation of the award-winning project, Dr Adil Jamal Akhtar said that Effortless Automated Phoroptor Device presented by the graduates of Ziauddin University Faculty of Engineering and Science Technology can test eyes faster than the device used in the US.
The baseline measurements were taken in both eyes before orthokeratology lens fitting in the morning at the initial visit, including visual acuity (logarithmic visual acuity chart, GB 11533-1989), manifest refraction (Phoroptor, Phorovist 200), corneal curvature (Keratometer, OM-4), noncontact tonometer (Nidek NT-2000), corneal topography (E300 Corneal Topographer), corneal endothelial count (Topcon, SP-2000P), and axial length (IOL-MASTER, Zeiss).
Contract Awarded for Pr# 629-16-3-7224-0195, Project Legacy, Sup Auto Phoroptor Auto Phoroptor
Reichert Technologies has announced the commercial introduction of its advanced 'Phoroptor VRx Digital Refraction System' (pictured above).
The 'Phoroptor VRx' was designed, engineered and built with input from eye care professionals.
The optical prescription for best photopic acuity at the test distance and the level of uniform convergent lens blur (i.e., positive-sphere dioptric power) used to induce the 20/40 (2.0 arcmin) and 20/30 (1.5 arcmin) acuity levels were implemented with an AO Master Phoroptor (AO Reichert Scientific Instruments, Buffalo, New York).
As participants viewed the acuity chart through the phoroptor with their presenting correction, the initial level of positive sphere blur (+4.0 to +5.0 diopters) was decreased in 0.125 D steps.
Essilor's latest 'APHS50' automatic phoroptor offers speed and comfort for all types of tests, with comprehensive visual assessment for both far and near vision.