Certified Ophthalmic Assistant Practice Exam

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Prepare for the Certified Ophthalmic Assistant Exam with flashcards and multiple-choice questions. Each question includes hints and explanations to enhance your understanding. Ace your exam with confidence!

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What axis orientation is involved in the transposition of cylinder lenses?

180 degrees
270 degrees
90 degrees
45 degrees

The correct answer is: 90 degrees

In the context of transposing cylinder lenses, the correct axis orientation involved is 90 degrees. Transposition of a cylindrical lens involves converting it from a plus cylinder to a minus cylinder form or vice versa. This process requires changing the power of the lens while simultaneously adjusting the axis orientation. When performing a transposition, the cylinder's axis is shifted by 90 degrees. For example, if a lens has a cylinder power at an axis of 180 degrees, when transposing it, the axis will then be adjusted to 90 degrees, signifying the new orientation of the cylindrical correction. The transformation helps maintain the same vision correction effect while changing the format of the lens prescription. Understanding this concept is fundamental for those preparing for the Certified Ophthalmic Assistant Exam, as the ability to accurately transpose prescriptions and comprehend the orientation of cylinder lenses is crucial in clinical practice.