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Abstract #8423 Published in IGR 5-1
The evaluation of tonometry and self-tonometry with Ocuton tonometers
Kothy P; Nagymihaly A; Hollo GMedical Science Monitor 2003; 9: PI1-PI4
BACKGROUND: The purpose of the present study was to evaluate the clinical applicability of the Ocuton-A and Ocuton-S applanation tonometers, and to compare their use and accuracy parameters to those of Goldmann applanation tonometry (GAT). MATERIAL/METHODS: In the first study, intraocular pressure (IOP) was measured with an Ocuton-A tonometer, followed by another measurement using GAT in 15 subjects (30 eyes). Ocuton-tonometry was performed on three occasions separated by three-minute intervals. In Study 2, the impact of increased patient familiarity on measurement accuracy using the self-tonometer was investigated in five subjects (ten eyes) by comparing two consecutive series of five Ocuton-S measurements. In Study 3, nine trained volunteers measured their own IOP with an Ocuton-S self-tonometer after GAT and Ocuton-A measurements by an experienced investigator. RESULTS: Study 1 showed that the measured IOP value was significantly higher using the Ocuton-A tonometer, compared to values obtained using GAT. In Study 2, the authors found that increased practice in self-tonometry did not alter measurement accuracy. In Study 3, the difference between IOP readings obtained with the Ocuton-S and Ocuton-A instruments was not significant. CONCLUSIONS: The portable Ocuton-A tonometer may become a useful instrument for IOP measurement by professional workers outside the clinic. Qualified patients are able to use the Ocuton-S self-tonometer reliably even after limited training, and its measurement accuracy is acceptable for IOP monitoring. Both the Ocuton A and S devices consistently overestimate the IOP by approximately 2 mmHg compared to the corresponding Goldmann readings.
Dr. P. Kothy, 1st Department of Ophthalmology, Semmelweis University, Tomo u 25-29, Budapest 1083, Hungary. kotpet@szem1.sote.hu
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
