What question did this study set out to answer?

The study aims to evaluate how consistent intraocular pressure measurements are using the Tono-Pen in children.

April 1, 2026

The Interoccasion Repeatability of Intraocular Pressure Measurement Using the Tono‐Pen in a Sample of School‐Aged Children

Key Points

The study aims to evaluate how consistent intraocular pressure measurements are using the Tono-Pen in children.
Measured intraocular pressure with the Tono-Pen XL in both eyes of 31 children on two occasions.
Participants were aged 6 to 14 years and recruited from a pediatric clinic.
Refractive error was assessed using noncycloplegic autorefraction.
No average difference in intraocular pressure measurements was observed between both occasions.
The 95% limits of agreement between occasions ranged from -5.58 to 4.87 mm Hg.

Abstract

Purpose. The purpose of this study was to assess the interoccasion repeatability of the Tono‐Pen XL portable applanation tonometer in school‐aged children. Methods. Thirty‐one normal children were recruited from The Ohio State College of Optometry Pediatric Clinic. They ranged in age from 6 to 14 years. Intraocular pressure was measured using the Tono‐Pen XL in both eyes of all subjects on two different occasions within a median of 9 days. Refractive error was measured by noncycloplegic autorefraction. Data from right eyes only are presented. Results. There was no average difference in the intraocular pressure between occasions. The 95% limits of agreement between occasions were −5.58 to 4.87 mm Hg. Conclusions. The Tono‐Pen XL gives reasonably repeatable readings between occasions in school‐aged children.

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