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Can Home Tonometry Detect Eye Pressure Peaks Missed at the Clinic?

Yes, home tonometry can record eye pressure peaks that a clinic visit may miss. In a study of 75 patients with glaucoma, suspected glaucoma, or elevated eye pressure, the highest home reading occurred outside clinic hours in 54 of 150 eyes (36%). The figure describes the highest readings the device captured during the study, and a home monitor can only capture pressure at the times you take a reading.

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Can Home Tonometry Detect Eye Pressure Peaks Missed at the Clinic?

Yes, home tonometry can record eye pressure peaks that a clinic visit may miss. In a study of 75 patients with glaucoma, suspected glaucoma, or elevated eye pressure, the highest home reading occurred outside clinic hours in 54 of 150 eyes (36%). The figure describes the highest readings the device captured during the study, and a home monitor can only capture pressure at the times you take a reading.

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How Does Home Tonometry Measure Eye Pressure?

A home rebound tonometer estimates eye pressure by measuring how quickly a tiny probe slows when it touches the clear front surface of your eye. The device turns that response into a reading in millimeters of mercury (mmHg). In the home monitoring study, patients practiced with a study coordinator before using the device on their own. They then took separate readings at different times during the loan period.

When Did Home Tonometry Record the Highest Eye Pressure?

Average eye pressure across the study group peaked in the early morning, although the timing could differ for each eye. The study defined clinic hours as 8 a.m. to 5 p.m. It also found some high home readings during those hours that didn't appear in the clinic records. A home check can add a reading at a time when you're away from the clinic, even during the workday.

Why Can Home Readings Show a Higher Peak but a Lower Average?

A series of home readings can include a higher peak and still average lower when it also captures low readings. In a study of patients with glaucoma, the average of each eye's highest reading was 20.8 mmHg at home and 17.6 mmHg at the clinic. The overall averages were 13.6 mmHg at home and 14.5 mmHg at the clinic. Patients measured more often at home, so the comparison reflects different testing schedules and settings as well as different devices.

How Consistently Did Patients Take Readings at Home?

Most patients in the prospective study met the requested testing frequency, while a smaller group took far fewer readings. After in-person training, 65% of patients averaged at least six readings per day, and 19% averaged fewer than two. Patients who took fewer readings reported trouble getting measurements or wanting more training. The results describe how often patients measured during a short device loan.

Learn More About Home Tonometry

Do You Need Numbing Drops for Rebound Tonometry?

No. The small probe touches the front of your eye briefly, and rebound tonometry doesn't require numbing drops.

Can Home Tonometry Diagnose Glaucoma?

No. Home tonometry estimates eye pressure. An eye doctor also checks for optic nerve damage and may test your field of vision when evaluating you for glaucoma.

Can Corneal Thickness Affect a Tonometry Reading?

Yes. In one comparison, thicker corneas were associated with higher readings on rebound, air-puff, and Goldmann tests. Goldmann tonometry uses a small tip to gently flatten part of the cornea, the clear front surface of the eye.

When to See Your Doctor

Contact your eye doctor if your home reading is higher than expected or you're unsure what it means. Ask whether you need a clinic pressure check and what readings should prompt a call in the future. Keep your scheduled eye visits while you measure at home, and talk with your eye doctor before making any treatment changes.

References

Clinical Ophthalmology. Home Tonometry Diurnal Intraocular Pressure Patterns, Patient Adherence, and Measurement Reliability in a Prospective Clinical Cohort. https://doi.org/10.2147/OPTH.S545165. Published September 26, 2025. Accessed November 10, 2026.

iCare. iCare HOME2 Instruction Manual. https://patients.icare-world.com/wp-content/uploads/2022/08/iCare_HOME2_Instruction_Manual_TA023-117-US-2_0.pdf. Publication date not verified. Accessed November 10, 2026.

JAMA. Screening for Glaucoma in Adults: Updated Evidence Report and Systematic Review for the US Preventive Services Task Force. https://jamanetwork.com/journals/jama/fullarticle/2792610. Published May 2022. Accessed November 10, 2026.

Journal of Current Ophthalmology. Cross-Sectional Study of Differences between Intraocular Pressure Measurements using Goldmann, iCare, and Air-Puff Tonometers and their Correlation with Central Corneal Thickness. https://pubmed.ncbi.nlm.nih.gov/39281393/. Published August 10, 2024. Accessed November 10, 2026.

Ophthalmology Glaucoma. Home Self-tonometry Trials Compared with Clinic Tonometry in Patients with Glaucoma. https://pubmed.ncbi.nlm.nih.gov/33845191/. Published April 9, 2021. Accessed November 10, 2026.

StatPearls Publishing. Tonometry. https://www.ncbi.nlm.nih.gov/books/NBK493225/. Updated December 12, 2023. Accessed November 10, 2026.