Tonometry: How to Remember?


Tonometry is the procedure performed to determine the intraocular pressure (IOP).


  • Imbert-Fick’s law
  • P= F/A
  • A= Area of contact flattening = 3.06

Tonometers are mainly of 2 types:

  1. Indentation tonometers:
    • Reading depends upon scleral rigidity: Not reliable
    • Ex:┬áSchiotz tonometer.
  2. Applatation tonometers:
    • Reading depends upon flattening of corneal surface
    • Ex: Goldmann, Perkins, Pulsair, Airpuff tonometer.
  3. (Indentation + Applanation) tonometer:
    • Ex: Tonopen.
  4. Dynamic contour tonometer:
    • Ex: Pascal tonometer.


MCQs on tonometer: How to Remember?

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