Back to Journals » Clinical Ophthalmology » Volume 3

Comparison of intraocular pressure measurements with the portable PT100 noncontact tonometer and Goldmann applanation tonometry

Authors Salim S, Linn DJ, Echols II JR, Netland P

Published 6 May 2009 Volume 2009:3 Pages 341—344

DOI https://doi.org/10.2147/OPTH.S5537

Review by Single-blind

Peer reviewer comments 6


Sarwat Salim, Daniel J Linn, James R Echols II, Peter A Netland

Hamilton Eye Institute, University of Tennessee Health Science Center, Memphis, TN, USA

Purpose: Noncontact tonometers are useful when regulations preclude use of contact tonometers by medical students and other nonophthalmologists. Our study compared the measurements by the portable, noncontact tonometer (PT100) with Goldmann applanation tonometry (GAT).

Methods: This was a prospective study of 98 eyes from 98 patients. Intraocular pressure (IOP) was measured by GAT and the PT100 (Reichert, Buffalo, NY).

Results: Mean IOP measurements showed no significant differences in measurements performed by the two tonometers (P = 0.64). Measurements by the two tonometers were in agreement by ≤3 mmHg in 92.8% of eyes. Linear regression analysis of PT100 vs GAT measurements revealed a slope of 0.98 with r2 = 0.58. Bland–Altman analysis showed a mean difference of measurements by GAT and PT100 of -0.3 mmHg with two standard deviation = 7.1 mmHg.

Conclusion: The portable noncontact PT100 tonometer provides IOP measurements comparable to GAT within the normal range of IOP.

Keywords: applanation tonometer, intraocular pressure, noncontact tonometry

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF]