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?
Whilst the spectacles may be the pride and joy of the patient, they may not have noticed the deterioration as they can't always see these without their spectacles on; the optometrist can show this to the patient when they have their prescription loaded into the trial frame or phoropter head during the eye examination.
Stolen were various items including an Occulus Trial Frame and two Hamblin diagnostic sets--ophthalmoscope and streak retinoscopes--one of which I had been using since I was a student 40 years ago.
One advantage of using this step-by-step method is that for each additional unit of magnification added in the trial frame, the patient should see an improvement, which helps in restoring confidence.
Shamir's unique As-Worn Technology bridges the geometric difference of the trial frame used when measuring the patient's prescription and the actual frame worn by them.
trial frame, visual fields equipment, NCT, retinal camera, slit lamp, optical coherence tomographers etc.