Certified Ophthalmic Assistant Practice Exam

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What color is the light filter used in applanation tonometry?

  1. Green

  2. Blue

  3. Yellow

  4. Red

The correct answer is: Blue

The light filter used in applanation tonometry is typically blue in color. This specific color helps enhance the visibility of the fluorescein dye that is used during the procedure. The blue filter allows for better contrast and visibility of the corneal surface, which is crucial for accurately measuring the intraocular pressure.

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