Wednesday, April 21, 2021


 Parts of a Schiotz tonometer



Anaesthetic eye drops (generally Paracaine), Schiotz tonometer with weight, Sterile cotton with spirit, Conversion chart



  • Anaesthetize the patient using local anesthetic eye drops.
  • The Schitoz tonometer is checked for zero error and its foot plate is cleaned by dabbing it against sterile cotton soaked in spirit.
  • Let the alcohol evaporate. (to prevent corneal damage)
  • POSITION- Patient in supine position, looking up at a fixation target with examiner at head end.
  • Separate the two eyelids of the patient.
  • Hold the tonometer as shown in figure (with the scale and handle/ holder of tonometer perpendicular to each other and the scale with readings is faced towards the examiner) and lower the tonometer plate so that it rests on the cornea & the plunger is free to move.
  • Footplate of the tonometer should be held vertically on the center of cornea.
  • The reading is noted (without any parallax).
  • Similarly, IOP of the other eye is measured.
  • The 5.5gm weight is initially used. If the scale reading is 3 or less, additional weight is added.
  • Incase the needle oscillates, take the higher reading.
  • Friedenwald conversion table is then used to derive the IOP in mmHg from the scale reading and the plunger weight.

REFERENCE VIDEO LINK: (** Spirit Lamp and antibiotic eye drops may not be required)

Written by our guest author Aishwarya Bagade
Illustrations by Devi Bavishi

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