Correlation and correction factors for different types of tonometry. Report 1

PURPOSE: Comparative analysis of the results of Mak-lakov tonometry (MT), Goldman applanation tonometry (GT) and Icare rebound tonometry (rt) in the following groups: «all patients», «low», «medium» and «high» IOP rate for the purpose of its proper interpretation, determination of unified correction coefficients and the points of application in the clinical practice. METHODS: In each of 294 cases (147 persons) IOP was measured by the above methods in the following order - RT, GT, MT. For a comparative analysis of measurement results and determination of correction factors Bland-Altman methods and simple regression analysis were applied. RESULTS: The difference in IOP level values in the «all patients» group: GT - MT was 4.6±1.9; GT - RT 1.9±2.9; MT - RT 6.7±2.7 mm Hg. In the groups of «average» and «low» standards IOP difference is comparable with the «all patients» group. The most significant difference was found in the range of «high» rate of IOP: GT - MT 5.6±2.1; GT - RT 2.49±3.5; MT - RT 8.0±3.6 mm Hg. The high value of the coefficient of determination (r²) MT and GT confirms the accuracy of data. The low value of r² when comparing the MT - RT and GT - RT indicates the approximate determination of IOP level by means of the Icare tonometer. CONCLUSION: Goldmann (P0) and Maklakov tonometry (Pt) are considered to be the tonometry benchmark. Alternative method of Icare rebound tonometry indicates the level of IOP, close to the level of true IOP, but has a large spread of deviations that cannot be attributed to the category of its precision. The significant dispersion in the measurement differences in range of «high» rate of IOP emphasizes the need to assess it in terms of «starting concepts», using only high-precision techniques. Icare tonometry is applicable for screening examinations (including pediatric), daily monitoring and self-control of IOP level, as well as in the general practice of «early» postoperative period, taking into account the use of identified correction factors.

глаукома, тонометрия, тонометрия по Маклакову, тонометрия по Goldman, тонометр Icare, истинное и тонометрическое внутриглазное давление, методы тонометрии, glaucoma, tonometry, Maklakov tonometry, Goldman tonometry, Icare tonometer, actual and tonometric intraocular pressure, tonometry methods

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