Certified Ophthalmic Assistant Practice Exam

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Study for the Certified Ophthalmic Assistant Exam. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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A lens consisting of two cylinders of equal but opposite powers is the

cross cylinder
bifocal lens
converging lens
dispersion lens

The correct answer is: cross cylinder

A lens consisting of two cylinders of equal but opposite powers is referred to as a cross cylinder. This type of lens is commonly used in ophthalmic practice to refine the axis of astigmatism correction. A cross cylinder helps the ophthalmic assistant to determine the exact axis of astigmatism and fine-tune the prescription for the patient. The other options can be explained as follows: B. A bifocal lens is a lens with two distinct optical powers to correct both near and distance vision. C. A converging lens is a lens that converges light rays to a focal point, used in cases of hyperopia or farsightedness. D. A dispersion lens is a lens that separates light into its component colors, commonly used in prism correction.