Certified Ophthalmic Assistant Practice Exam

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Applanation tonometry readings need to be multiplied by what number to obtain the mm Hg?

  1. 5

  2. 10

  3. 15

  4. 20

The correct answer is: 10

Applanation tonometry readings need to be multiplied by 10 to obtain the measurement in mm Hg. This is because the instrument measures the force required to flatten a small area of the cornea, known as applanation. This force is directly related to the intraocular pressure (IOP) within the eye. Therefore, in order to convert the reading obtained from applanation tonometry to the standard unit of mm Hg, it needs to be multiplied by 10. This conversion factor ensures that the intraocular pressure is accurately represented in the standard unit used in ophthalmology. The other options (A, C, and D) are incorrect multipliers and would not provide the accurate mm Hg measurement when applied to the applanation tonometry readings.

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