trial lens


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trial lens

A lens used in testing the vision.
See also: lens
References in periodicals archive ?
In perimetry, a trial lens provides the refractive correction needed so each patient can see clearly during the test.
00D trial lens monocularly over each eye while wearing the full distance correction, and asking the patient whether the view is clearer when the lens is over the right eye or the left eye.
Asking high-quality open questions when taking a history (see panel below) and physically demonstrating the difference that toric lenses make, simply by holding a cylindrical trial lens over a spherical contact lens correction, are useful communication strategies for eliciting the need for a change.
Tenders are invited for Refraction Unit With Trial Lens Set And Stool
Therefore, it seems as though trial lens fitting is still the best option available in optometric practice.