Practice Quiz

Ophthalmic Technician

Category - Keratometry, Tonometry, and Refractometry

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Which of the following is inappropriate regarding intraocular measurement?
  1. Diurnal variation of 3 - 4 mm of Hg is considered normal
  2. A difference of >2mm of Hg is considered significant
  3. Measurement of intraocular pressure needs to be corrected based on the thickness of the cornea
  4. An intraocular pressure measurement within the range of 8 - 21 mm of Hg always rules out the possibility of glaucoma
Explanation
Answer: D - An intraocular pressure measurement within the range of 8 - 21 mm of Hg DOES NOT always rule out the possibility of glaucoma.

Normal tension glaucoma or low tension glaucoma is a variant of glaucoma that occurs in spite of the intraocular pressure being within the normal range.
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