Ophthalmic Assistant

Category - Keratometry, Tonometry, and Refractometry

On an astigmatic clock, the correcting cylinder is placed how many degrees from the blackest line?
  1. 30 degrees
  2. 60 degrees
  3. 90 degrees
  4. 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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