trial frame


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tri·al frame

a type of spectacle frame with variable adjustments, for holding trial lenses during refraction.

tri·al frame

(trī'ăl frām)
A type of spectacle frame with variable adjustments, for holding trial lenses during refraction.

trial frame

An eyeglass frame for holding trial lenses while a person is being fitted for glasses.
See also: frame

trial frame 

Spectacle frame with variable adjustments for interpupillary distance, side length, etc. in which each lens rim is fitted with a number of cells into which trial lenses can be placed when testing vision (Fig. T18). See phoropter; Simultantest.
Fig. T18 Trial frameenlarge picture
Fig. T18 Trial frame
References in periodicals archive ?
The amount of plus prescribed can be decided by assessing the lag with different plus lenses in place; again, a range of glazed frames can be useful to replace the trial frame.
When I give you your prescription here (place trial frame on the patient with the correction in place) how does that feel?
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.
A case from 1894 containing 43 pairs of metal-rimmed and goldrimmed trial lenses, plus two trial frames.
Different types of Telescopes, Magnifiers, Visual Acuity charts, LEA symbols, trial frames, trail boxes, Field Magnifier and TV 300 system were also provided in the kit.
To celebrate the World Sight Day, Meghrigian Instituite decided to donate ophthalmic trial lens sets and trial frames
Somec offers both standard and custom road and Time Trial frames using only Columbus and Dedacciai carbon, aluminum, and steel.
Tenders are invited for Establishment of Eye Vision Centre Trial lens sets with Trial frames