It is important to determine the
intra-ocular pressure, the fluid pressure inside the eye, in order to evaluate
for patients at risk from glaucoma, because of potential damage to the optic
nerve.
Tonometers are calibrated to measure pressure in millimeters of mercury
[mmHg]. There are many different types of tonometers, including Schiotz, Goldmann, Perkins, Marg-MacKay, Air-Puff (American Optical), and the new
“Triggerfish” wireless contact lens (Sensimed AG). Preliminary mechanics and
development work in this area was presented by Friedenwald. This list is
certainly not exhaustive, as there are many new devices developed in recent
years, including the Tono-Pen, ocular bounce, resonant tonography, and dynamic
pascal tonometry.
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