Bivariate analysis of surgically induced regular astigmatism. Mathematical analysis and graphical display.

@article{Naeser1999BivariateAO,
  title={Bivariate analysis of surgically induced regular astigmatism. Mathematical analysis and graphical display.},
  author={Kristian Naeser and Jesper O. Hjortdal},
  journal={Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians},
  year={1999},
  volume={19 1},
  pages={50-61}
}
OBJECTIVE The purpose of the study was to develop methods for simultaneous description of astigmatic direction and magnitude on aggregate data, with special reference to refractive surgery. DESIGN Mathematical analysis of astigmatisms employing bivariate statistical methods. RESULTS The mean of several astigmatisms is a new astigmatism of specific direction and magnitude, while the confidence region is an area, which may be determined exactly. CONCLUSIONS Astigmatisms may conveniently be… CONTINUE READING

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