Rebound Tonometry vs Air Puff Tonometry: What Is the Difference?

Rebound Tonometry vs Air Puff Tonometry: What Is the Difference?

Intraocular pressure (IOP) measurement is a fundamental part of every comprehensive eye exam. Two of the most common methods used in clinical practice are rebound tonometry and non-contact (air puff) tonometry. While both measure IOP, they work very differently — and the differences matter for patient experience, clinical workflow, and accuracy.

How Air Puff Tonometry Works

Non-contact tonometry, commonly called air puff tonometry, works by directing a brief burst of air at the cornea. The instrument measures how the cornea deforms in response to the air puff and calculates IOP from that measurement.

Characteristics of air puff tonometry:

• No physical contact with the eye
• No anesthetic drops required
• Patients often find the air puff startling or uncomfortable
• Can create microaerosol formations during measurement
• Requires calibration
• Typically table-mounted, limiting patient positioning

How Rebound Tonometry Works

Rebound tonometry uses a small, lightweight disposable probe that briefly and gently contacts the cornea. The probe's rebound motion is analyzed by the instrument to calculate IOP. iCare's patented rebound technology is the most widely used system of this type in clinical practice.

Characteristics of rebound tonometry:

• Uses a single-use disposable probe for hygienic measurement
• No anesthetic drops required
• Measurement is barely noticed by most patients
• No microaerosol formation
• No calibration needed
• Handheld and portable — can be used in multiple patient positions
• Suitable for all patients including children and non-compliant patients

Key Differences Side by Side

Feature	Rebound Tonometry	Air Puff Tonometry
Patient comfort	High — probe barely noticed	Lower — air puff is startling for many patients
Anesthesia required	No	No
Calibration required	No	Yes
Portability	Yes — handheld	No — table mounted
Patient positioning	Flexible	Seated only
Microaerosol risk	No	Yes
Suitable for children	Yes	More challenging
Single-use probe	Yes	No

Which Is Better for Your Practice?

For most eye care practices, rebound tonometry offers significant advantages in patient comfort, workflow flexibility, and hygiene. The ability to measure IOP in any position — seated, standing, or supine — makes handheld rebound tonometers versatile tools for practices of all sizes.

Air puff tonometers remain in use in many practices, particularly where a table-mounted instrument is already integrated into the exam lane workflow.

Rebound tonometry is generally preferred when:

• Patient comfort is a priority
• You need to measure IOP in non-standard positions
• You are working with pediatric or non-compliant patients
• You want a portable solution for multiple exam rooms
• Hygiene and cross-contamination risk are a concern

iCare Rebound Tonometers Available Through Blue River Medical

Blue River Medical represents iCare across Colorado, Arizona, New Mexico, Wyoming, and Utah. The iCare IC100 and IC200 are both rebound tonometers that deliver fast, accurate IOP measurements without anesthesia, air, or calibration.

• iCare IC100 — portable rebound tonometer for routine IOP screening
• iCare IC200 — advanced rebound tonometer with 200-degree positional freedom and Quick Measure mode

For a detailed comparison of the two, see our post on iCare IC100 vs IC200.

Call us at (877) 707-5688 or contact us to learn more about iCare tonometers for your practice.