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Marcio H. Mendes, Alberto J. Betinjane, simone finzi; Evaluation Of Different Tonometers In Patients With Congenital Glaucoma. Invest. Ophthalmol. Vis. Sci. 2012;53(14):5051.
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To study the values obtained with the most utilized types of tonometers in the clinical practice to measure intraocular pressure of patients with congenital glaucoma.
Patients were classified in two groups: Group A (congenital glaucoma), and group B (control group). Exclusion criteriae was diffuse corneal oedema. After anamnesis and biomicroscopy, tonometry with Goldman, Tonopen, Perkins and Pascal devices were proceeded. The order of use was randomized. Goldmann tonometry was assumed as the Gold Standard . Difference higher than 1 mmHg was considered clinically significant, being defined as discordance of values.
78 eyes with congenital glaucoma and 39 healthy eyes were examined. Tonometric mean in both groups, regard with these different devices, are presented in table 1. Glaucomatous group revealed 12,8% of the patients with discordance (difference higher than 1 mmHg), comparing Goldmann and Perkins. The discordance rate with the Tonopen was 39,7%, and with Pascal was 62,8%. The discordance rates in the control group were: Perkins (10,2%), Tonopen (30,7%) and Pascal (30,7%) - table 2.
The present study revealed greater discordance with Pascal, followed by Tonopen and Perkins in the glaucomatous group. Tonopen and Pascal devices had the same discordance rate, followed by Perkins, in the control group. According to these results, the Perkins tonometer show higher concordance rate than the other devices tested in patients with congenital glaucoma.
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