What a Schiotz Tonometer Is A Schiotz tonometer is a classic ophthalmic instrument used to measure intraocular pressure (IOP) — the fluid pressure inside the eye. � How it works It’s an indentation tonometer: a weighted plunger rests on the cornea and gently indents it. The depth of indentation is read on a scale, then converted into mmHg (the unit for IOP) using a conversion table. 👇👇👇👇✅✅✅✅✅✅✅ Normal Intra-Ocular Pressure (IOP) of the Eye Normal range: 10 – 21 mmHg Average IOP: ~15–16 mmHg

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