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Abstract #6037 Published in IGR 2-2
Influence of keratometric readings on comparative intraocular pressure measurements with Goldmann, Tono-Pen and noncontact tonometers
Paranhos A Jr; Paranhos FRL; Prata JA Jr; Omi CA; Mello PAA; Shields MBJournal of Glaucoma 2000; 9: 219-223
PURPOSE: To evaluate the influence of keratometric measurements on the concordance of intraocular pressure (IOP) readings with three applanation tonometers. PATIENTS AND METHODS: The IOPs of 404 eyes of 202 patients from a general eye clinical were measured by Goldmann, Tono-Pen XL, and noncontact Nidek NT 2000 tonometers. Differences in the IOP measurements between Goldmann and the other two tonometers (ΔIOPG-TP and ΔIOPG-NCT) were analyzed in the overall group and within three subgroups, based on keratometry measures: flatter, intermediate, and steeper corneas (quartiles as cut-off points). Regression analysis of ΔIOP and keratometry measures was also performed. Right and left eyes were analyzed separately. RESULTS: The IOP readings taken with the Goldmann tonometer were significantly higher than those taken with either of the other two tonometers within the overall study population. The ΔIOP within the three keratometric subgroups was not statistically significant except for ΔIOPG-TP in the right eyes. Regression analysis showed that keratometry and ΔIOPG-TP and ΔIOPG-NCT had a significant, but very weak, coefficient of correlation in the right eye, but not in the left. CONCLUSIONS: Corneal curvature within the normal range does not have a clinically significant influence on the concordance of IOP readings obtained with Goldmann and Tono-Pen or noncontact tonometers.
Dr. A. Paranhos Jr, 38 Street, 300, Marista, Goiania, Goias, Brazil 74150250
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
