The literature on intra-ocular
pressure dynamics is reviewed, including tonometer design and calibration, the
influence of corneal-scleral mechanics, and scleral rigidity factors. Drugs that influence the outflow facility of the trabecular mesh work (TM) are discussed. Transmural pressure drop across the lamina cribosa (LC) is an
important parameter, in terms of quantifying potential glaucoma damage to the
optic nerve.
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.
Tono meters 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.
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