What is the role of the PASCAL Dynamic Contour Tonometer in the workup of primary open-angle glaucoma (POAG)?

Updated: Mar 16, 2020
  • Author: Kristin Schmid Biggerstaff, MD; Chief Editor: Inci Irak Dersu, MD, MPH  more...
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Answer

The PASCAL Dynamic Contour Tonometer is a digital contact tonometer that directly measures IOP continuously based on a numeric output of IOP and ocular pulse amplitude (OPA). Unlike applanation tonometry, which is influenced by corneal thickness and other characteristics of the cornea, the PASCAL Dynamic Contour Tonometer provides a direct measurement of IOP, independent of interindividual variations in corneal properties and biomechanics, and also measures pulsatile pressure fluctuations caused by the change in ocular blood flow during systole versus diastole. [1, 19]

In cases of increased corneal or scleral rigidity (ie, S/P keratoplasty, scleral buckle), the newer methods, as described above, as well as other alternatives, such as pneumotonometry or Tono-Pen, may also be more accurate than applanation methods.


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