Practice Quiz

Certified Ophthalmic Medical Technologist (COMT)

Category - COMT

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A Goldmann tonoprism needs to be adjusted at corneal astigmatism greater than what level?

  1. 1 D
  2. 2 D
  3. 3 D
  4. Adjustment for astigmatism is unnecessary.
Explanation

Answer: D - A Goldmann tonoprism needs to be adjusted at corneal astigmatism greater than 3 D.

Compensation for high corneal astigmatism (an astigmatic cornea over 3 D) should be made to avoid an improper measurement. If the tonoprism is not adjusted correctly, the measurement could be 2 to 3 mmHg off.

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