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In perimetry, a trial lens provides the refractive correction needed so each patient can see clearly during the test.
Patients are even provided with a unique PreVue trial lens in order to "preview" their potential vision before CustomVue treatment is performed.
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
However, the amount of change and final shape of the cornea is still largely dependent on the same nineteenth century trial lens technology used when a contact lens or spectacle prescription is measured.
Therefore, it seems as though trial lens fitting is still the best option available in optometric practice.