Certified Ophthalmic Medical Technologist (COMT) Practice Exam

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What type of lenses are the "R" lenses located on auxiliary dials of a refractor used for?

  1. Correction of hyperopia

  2. Retinoscopy

  3. Measurement of intraocular pressure

  4. Enhancing night vision

The correct answer is: Retinoscopy

The "R" lenses on auxiliary dials of a refractor are specifically designed for use in retinoscopy. Retinoscopy is an essential technique used by eye care professionals to assess the refractive error of the eye without requiring the patient to provide subjective responses. During this process, a beam of light is directed into the patient's eye, and the technician observes the reflex of the light from the retina. The "R" lenses serve to neutralize the reflex and help determine the appropriate prescription. In the context of this question, the use of "R" lenses in retinoscopy underlines their purpose in the objective measurement of refractive errors. This is a crucial step in determining appropriate corrective lenses for patients with vision problems.