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
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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.
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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.
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A case from 1894 containing 43 pairs of metal-rimmed and goldrimmed trial lenses, plus two trial frames.
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To celebrate the World Sight Day, Meghrigian Instituite decided to donate ophthalmic trial lens sets and trial frames
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Tenders are invited for Establishment of Eye Vision Centre Trial lens sets with Trial frames
Establishment Of Eye Vision Centre Trial Lens Sets With Trial Frames

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