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M. Shimmyo; Clinical Comparison of IOP Measurements by Goldmann Applanation Tonometry, Reichert's Ocular Response a Nalyzer and Pascal Dynamic Contour Tonometry . Invest. Ophthalmol. Vis. Sci. 2005;46(13):4840.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: Comparison of accuracy of intraocular pressure (IOP) measurements by 3 methods simultaneously by Goldmann applanation tonometry (GAT) corrected for central corneal thickness (CCT), Reichert's Ocular Response Analyzer (ORA) and Pascal Dynamic Contour Tonometry (DCT). Methods: IOP was measured in 840 eyes of human patients by GAT and CCT, ORA and DCT. Other ocular parameters such as CCT and corneal curvature were also measured. Results: Mean GAT was 15.8 +/– 4.2 mmHg, IOP by ORA 13.0 +/– 2.9 mmHg, IOP by DCT 18.2 +/– 4.5 mmHg. Pearson correlation coefficients (R) of 14 parameter matrix (98pairs) and regression formulas were obtained. IOP corrected for CCT was correlated most with GAT (R=.83), then with IOP by ORA (R=.57), Extraocular pressure (EOP) by ORA (R=.51) and IOP by DCT (R=.48). IOP by ORA was better correlated to GAT (R=.72) than IOP by DCT (R=.56). CCT was moderately correlated to corneal hysteresis (HYS) by ORA (R=.28) and Ocular pulse amplitude (OPA) by DCT (R=.35). The data was further analyzed by age, sex, and race. Conclusions: IOP measured indirectly by corneal deformation is influenced by dimensions of corneal structure and elasticity of corneal tissue. Alternate IOP measurements by ORA and by DCT yield somewhat different IOP values from GAT and GAT corrected for CCT. EOP and Corneal hysteresis by ORA and OPA by DCT yield information not previously measurable by GAT. IOP should be considered as a multi–dimensional variable.
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