The accuracy of Goldmann applanation tonometry over silicone hydrogel contact lenses in patients with glaucoma

Autor: Rachel S. Cavalcanti, Beatriz de Abreu Fiuza Gomes, Haroldo Vieira de Moraes, Paulo Romeu de Freitas Turiel, Marcony R. Santhiago
Rok vydání: 2014
Předmět:
Zdroj: Contact Lens and Anterior Eye. 37:297-299
ISSN: 1367-0484
DOI: 10.1016/j.clae.2014.04.003
Popis: Purpose To investigate the accuracy of measuring intraocular pressure over a silicone hydrogel contact lens using Goldmann applanation tonometry in eyes with glaucoma. Methods This was a prospective, randomized study and enrolled 28 patients (28 right eyes) with primary open angle glaucoma. Intraocular pressure was taken with and without a silicone hydrogel contact lens (−0.50 D), in situ (using Goldmann applanation tonometry), in a randomized order of measurements. Statistical analysis was performed using paired t -test and Bland–Altman plot. Results The mean difference (± standard deviation) found between intraocular pressure measurement without (mean 16.7±3.2mmHg) and with (mean 17.3±3.0mmHg) contact lens was found to be −0.57±2.3mmHg (95% confidence interval, −1.5 to 0.3). No significant statistical difference was found between the two groups with paired t -test ( p =0.19). The Bland Altman plot showed some evidence of increasing variability of differences between two measures of intraocular pressure, with increasing intraocular pressure. The 95% limits of agreement of the Bland Altman plot were unacceptably large (−5mmHg to 3.9mmHg). Conclusion Agreement between Goldmann applanation tonometry with and without contact lenses seems to be poor in patients with glaucoma, especially for high intraocular pressure.
Databáze: OpenAIRE
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