---
title: "What is non-contact tonometry?"
description: "Non-contact tonometry is a way of measuring eye pressure using a gentle puff of air. ## What to expect during non-contact tonometry You rest your chin on a support and look at a small light. A short puff of air…"
url: "https://bluefinvision.com/knowledge-base/topics/diagnostics-testing/what-is-non-contact-tonometry/"
updated: "2025-12-31"
category: "Diagnostics & Testing"
---

# What is non-contact tonometry?

Non-contact tonometry is a way of measuring eye pressure using a gentle puff of air.

## What to expect during non-contact tonometry

You rest your chin on a support and look at a small light. A short puff of air briefly flattens the cornea, and the machine calculates the pressure inside your eye.

- The test is quick and does not touch the eye
- You might feel a mild surprise from the puff but no real pain
- No drops are usually needed and vision remains clear
- Results help screen for conditions like glaucoma

## Why eye pressure measurement matters

Eye pressure is one factor influencing the health of the optic nerve. Regular checks can detect problems early, often before you notice changes in vision.

- Raised pressure may prompt further tests or treatment
- People with a family history of glaucoma benefit from regular screening
- Readings can vary, so repeat measurements are sometimes required
- The test is safe for most patients, including children