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Abstract #9751 Published in IGR 5-3
Non-contact tonometers (Topcon CT 60 and CT 80) and Goldmann applanation tonometry
Teixeira RMB; Matsuhara ML; Gusmao de Almeida HRevista Brasileira de Oftalmologia 2003; 62: 509-514
OBJECTIVE: To study the relationship between Topcon non-contact tonometers, models CT 80 and CT 60, and Goldmann applanation tonometer. LOCATION: Instituto de Olhos de Belo Horizonte. METHODS: Comparison between the measurement of intraocular pressure (IOP) evaluated with Topcon non-contact tonometers CT 80 and CT 60 and IOP measured by Goldmann applanation tonometer. RESULTS: Mean IOP (± SD) measured by the CT 80 tonometer was OD: 19,67 (± 3.65 mmHg) and OS = 20,00 (± 3.56 mmHg) while the mean IOP (± SD) measured by the Goldmann applanation tonometer was: OD = 17.83 (± 3.95 mmHg), OE = 17.69 (± 4.17 mmHg). This difference was statistically significant (p < 0.001) for OD and OS. However, there was good correlation between the measurements (r = 0.62 for OD and r = 0.64 for OE). Mean IOP (± SD) measured by the CT 60 tonometer was OD: 20,11 (± 3.73 mmHg) and OS = 19.97 (± 3.33 mmHg), while mean IOP (± SD) measured by the Goldmann applanation tonometer was: OD = 18.22 (± 3.45 mmHg), and OE = 18.35 (± 3.65 mmHg). This difference was statistically significant (p < 0.001) for OD and OS. However, there was good correlation between the measurements (r = 0.62 for OD and r = 0.65 for OE). CONCLUSIONS: There was a good correlation between IOP measured by the non-contact tonometers (Topcon CT 80 and Topcon CT 60) with the Goldmann applanation tonometer. However, the comparison between the groups showed that IOP measured by non-contact tonometers is significantly higher than IOP measured by Goldmann applanation tonometry. These data suggest that the non-contact tonometry should only be considered as a screening method for IOP measurements. The statistically significant difference between the values of IOP measured by non-contact tonometry and Goldmann applanation tonometry suggests that non-contact tonometry should not be used in the diagnosis and follow-up of glaucoma patients. LA: Portuguese
Dr. R.M.B. Teixeira, Rua Padre Rolim, 541, Belo Horizonte-MG-CEP: 30130-090, Brazil
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
