The accuracy of Goldmann applanation tonometry over silicone hydrogel contact lenses in patients with glaucoma |
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Affiliation: | 1. Department of Neurology, People''s Hospital of Jiangxi Province, Nanchang, Jiangxi Province, China;2. Institution of Neurology, People''s Hospital of Jiangxi Province, Nanchang, Jiangxi Province, China;3. Department of Pediatrics, People''s Hospital of Jiangxi Province, Nanchang, Jiangxi Province, China;1. University Hospital Center Rijeka, Rijeka, Croatia;2. University of Rijeka Medical School, Rijeka, Croatia |
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Abstract: | PurposeTo investigate the accuracy of measuring intraocular pressure over a silicone hydrogel contact lens using Goldmann applanation tonometry in eyes with glaucoma.MethodsThis 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.ResultsThe mean difference (± standard deviation) found between intraocular pressure measurement without (mean 16.7 ± 3.2 mmHg) and with (mean 17.3 ± 3.0 mmHg) contact lens was found to be −0.57 ± 2.3 mmHg (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 (−5 mmHg to 3.9 mmHg).ConclusionAgreement between Goldmann applanation tonometry with and without contact lenses seems to be poor in patients with glaucoma, especially for high intraocular pressure. |
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Keywords: | Intraocular pressure Tonometry Contact lens Glaucoma |
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