advertisement
Abstract #3454 Published in IGR 4-2
Comparison of Goldmann applanation tonometry with the Tonopen for measuring intraocular pressure in a population-based glaucoma survey in rural West Bengal
Bandyopadhyay M; Raychaudhuri A; Lahiri SK; Schwartz EC; Myatt M; Johnson GJOphthalmic Epidemiology 2002; 9: 215-224
AIM: This study was undertaken to compare the measurement of intraocular pressure (IOP) in a population-based glaucoma survey by the Goldmann Applanation Tonometer (GAT) and the Tonopen with respect to IOP readings, the time required to measure IOP and subjects' preference for the two instruments. The purpose of the study was to see which of the two instruments could be more suitable in a rural survey, particularly house-to-house, in trying to find cases of advanced glaucoma. METHODS: The study was conducted on a total of 203 subjects as a part of a population-based glaucoma survey. The IOP of one randomly selected eye of each subject was measured, first with the GAT and subsequently with the Tonopen. The time taken for each procedure was noted and subjects' preference was ascertained. RESULTS: The mean of the paired differences between the readings of the two instruments (Tonopen minus GAT) was 1 mmHg with a standard deviation of 2.28. The Tonopen readings were within ±3 mmHg of the GAT readings in 86.2% of eyes. In 7.4% of the eyes the paired differences were ≥ ±5 mmHg. Measurement of IOP by the Tonopen was much quicker, the mean time difference being 38.7 seconds. Subjects' preference for the Tonopen was greater. CONCLUSIONS: The overall agreement between the measurements of the two instruments was good, but a small percentage of large difference (≥ ±5 mmHg in 7.4%) may be of concern in a population-based survey. The time to measure IOP and the subjects' preference strongly favored the Tonopen.
Dr. M. Bandyopadhyay, Mr. B.B. Roy Barman, 364/19 N.S.C. Basu Road, Calcutta-700 047, India. manasban@hotmail.com
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
