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 ?
With trial frame: near--14[DELTA] base out; distance 10[DELTA] base out
This is easier to say than to put into practice; the third article of this series (see OT March 23 2012) discussed the difficulty of a young child wearing a trial frame and how this can sometimes make it difficult to record a reliable corrected acuity, if the child is distracted by the discomfort and restricted field from the frame.
Tenders are invited for Supply of Medical Instruments-Manual Distance Vision Drum with bulb and plug,Trial Set with Trial Frames (Adult)
A case from 1894 containing 43 pairs of metal-rimmed and goldrimmed trial lenses, plus two trial frames. This traditional lens-testing method has now been replaced by automatic refraction machines.
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
first assessed the impact of new frame rate by actual coding trial frames and then decided how to change frame rate [12].
Tenders are invited for Establishment of Eye Vision Centre Trial lens sets with Trial frames
The field test was highlighted as a dislike by 14% of respondents and 10% do not enjoy wearing the heavy trial frames.