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Intraocular Pressure Measurement Variability Associated With Face Mask Use.

Ortal Fogel Tempelhof¹, Yael Reich², Rony Rachmiel¹

¹Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Tel Aviv 6423906, Israel. Affiliated to The Faculty of Medicine, Tel Aviv University, Israel.

Journal of Glaucoma

|March 26, 2026

Summary

This summary is machine-generated.

Face masks can impact intraocular pressure (IOP) measurements, with significant clinical changes observed in about one-third of glaucoma patients. Further IOP evaluation without masks is recommended for accurate clinical decisions.

Keywords:

Goldmann applanation tonometer KN95 glaucoma intra-ocular pressure mask

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Area of Science:

Ophthalmology
Glaucoma Research
Public Health Measures

Background:

Intraocular pressure (IOP) is a critical, manageable factor in glaucoma, a leading cause of blindness.
Face masks are essential for reducing respiratory infection transmission, as seen during global outbreaks like COVID-19.

Purpose of the Study:

To evaluate the effect of wearing face masks on intraocular pressure (IOP) measurements.
To understand potential clinical implications for glaucoma management.

Main Methods:

A prospective, randomized, controlled, and blinded clinical study.
Adult patients underwent IOP measurements using Goldmann applanation tonometry with surgical masks, KN95 masks, and without a mask (control).

Main Results:

No statistically significant differences in IOP readings were found between mask conditions (P=0.116).
However, 34.0% of patients showed an IOP difference of 3 mm Hg or more.
These variations were not statistically significant (P=0.546) and unaffected by gender, laterality, medication, or prior treatments.

Conclusions:

Face masks have a multi-factorial and inconsistent impact on IOP measurements.
Clinical significance in IOP variations was noted in approximately one-third of patients.
Factors like mask fit and breathing patterns may influence IOP readings, warranting further clinical consideration.