Clinical observation of a quantitative microkeratoscope used for corneal astigmatism

Objective To observe the result of measuring corneal astigmatism with a quantitative microkeratoscope.Methods Refractive error and the axis of corneal astigmatism of 101 eyes from 68 subjects were measured with a quantitative microkeratoscope to obtain the mean values from three measurements,and then the eyes were checked with both a keratometer and keratopographer.The measurements obtained with the three instruments were statistically analyzed for agreement.Results The corneal astigmatism readings obtained with the microkeratoscope,keratometer and keratopographer were(2.62±1.20)D,(2.66±1.26)D,and(2.66±1.26)D,respectively.And the axis values were 92.29°±10.90°,92.81°±11.15°,and 93.33° ±10.94°,respectively.There were no statistically significant differences among the measurement data from the 3 different devices for degree of corneal astigmatism and the axis of corneal astigmatism.Conclusion When corneal astigmatism is measured with a quantitative microkeratoscope,the measurements are comparable to those obtained by both keratometry and keratopography.