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Ophthalmic Assistant

Category - Keratometry, Tonometry, and Refractometry

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On an astigmatic clock, the correcting cylinder is placed how many degrees from the blackest line?

30 degrees
60 degrees
90 degrees
120 degrees

Explanation

Answer: C - 90 degrees

On an astigmatic clock, the correcting cylinder is placed 90 degrees from the blackest line. The blackest line corresponds to the axis of the rays of light that are most in focus.

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