Ophthalmology• Updated 21 October 2026
Eye Pressure Test (Tonometry)
A quick test that measures the pressure inside the eye to check for glaucoma.
Results: Immediately
Quick Summary
Primary Purpose
To screen for and monitor glaucoma.
What It Measures
Intraocular pressure.
Preparation
No preparation.
Overview
Pressure is measured with a puff of air or a small probe after numbing drops.
Normal pressure doesn't completely rule out glaucoma.
What It Measures
Eye pressure
Measured in mmHg.
How It's Performed
- 01
Drops
Numbing drops for contact tonometry.
- 02
Measure
A puff of air or a gentle touch.
- 03
Done
A few seconds.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| Eye pressure | 10–21 | mmHg |
Interpreting Results & Next Steps
Discuss with Doctor
Your doctor will explain the report and what happens next.
If values are High:
High pressure increases glaucoma risk.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Glaucoma Tests(opens in a new tab) · MedlinePlus, US National Library of Medicine