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J AAPOS. 2012 Jun;16(3):242-8. doi: 10.1016/j.jaapos.2011.12.150. Epub 2012 Mar 28.

Comparison of Tono-Pen and Goldmann applanation tonometers for measurement of intraocular pressure in healthy children.

Author information

  • 1Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison, Wisconsin, USA. pedig@jaeb.org

Abstract

PURPOSE:

To assess the agreement of intraocular pressure (IOP) measured with the Tono-Pen and the Goldmann applanation tonometer (GAT) in normal children and adolescents.

METHODS:

A total of 439 subjects from birth to <18 years of age without anterior segment anomalies or glaucoma had their IOP measured with the two instruments by separate, masked examiners in the office or under general anesthesia.

RESULTS:

On average, the Tono-Pen measured values slightly lower than the GAT for IOP <11 mm Hg and slightly higher than the GAT for IOP >11 mm Hg in the office setting. Using the average of GAT and Tono-Pen IOPs to estimate the true IOP, the average difference (GAT - Tono-Pen) was 0.4 mm Hg at IOP of 10 mm Hg and -3.0 mm Hg at IOP of 20 mm Hg. The 95% limits of agreement on the average difference between instruments were ± 6.4 mm Hg in the office setting and ± 6.8 mm Hg under general anesthesia. Larger differences between instruments were found with younger age. Standard error of measurement with the Tono-Pen was 1.44 mm Hg and 1.82 mm Hg for the office and anesthesia settings, respectively. Thicker corneas were associated with higher IOP with both the GAT and the Tono-Pen.

CONCLUSIONS:

In normal children, average differences between IOP measured by Tono-Pen and GAT were small, although there was substantial test-retest variability. Younger age was associated with larger average differences, as was higher IOP in the office setting.

Copyright © 2012 American Association for Pediatric Ophthalmology and Strabismus. Published by Mosby, Inc. All rights reserved.

PMID:
22459105
[PubMed - indexed for MEDLINE]
PMCID:
PMC3428123
Free PMC Article

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