| BRIEF COMMUNICATION |
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| Year : 2008 | Volume
: 56
| Issue : 6 | Page : 516-517 |
Agreement between two Goldmann type applanation tonometers
Ronnie George, Hemamalini Arvind, M Baskaran, S Ve Ramesh, Prema Raju, Lingam Vijaya
Glaucoma Services, Medical and Vision Research Foundation, Sankara Nethralaya, Chennai, India
Correspondence Address:
Ronnie George
Medical Research Foundation, Sankara Nethralaya, 18, College Road, Chennai-600 006
India
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DOI: 10.4103/0301-4738.43381 PMID: 18974529
The aim of the study was to assess agreement between two commercially available applanation tonometers for the measurement of intraocular pressure (IOP). Forty subjects underwent IOP measurement on two accurately calibrated Goldmann type applanation tonometers (Zeiss AT 030 (GATZ) and Inami L-5110(GATI)). The order of examination was randomized and observers were masked to the IOP recorded. The mean of two consecutive readings, from a randomly selected eye for each subject, was used for analysis. Agreement was assessed using the Altman and Bland plot. The mean (SD) IOP readings on GATZ was 15.32 (±6.80) mm Hg and on GATI was 13.52 (±5.65) mm Hg (p<0.001, 95% CI of the difference: -2.48 to -1.11). The 95% limits of agreement on the Altman and Bland plot were:-2.47 to 6.16 mm Hg). There was significant inter-instrument variability between the two accurately calibrated Goldmann type applanation tonometers studied.
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