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Impressum
Calculation of the Numerical Eccentricity of the Cornea
Wahl J., Preußner P.-R., Kramann C.
Augenklinik, Johannes-Gutenberg-Universität, Mainz
Background: Until now there is no suitable method available to
calculate the numerical eccentricity of the cornea exactly, because it
is different in different meridians. Averaging is mathematically wrong.
Method: Videokeratoscopic recordings are taken using the technomed™
CScan. From these raw data arithmetic means of the curvation radii are
calculated for constant distances from the optical axis. For this one-dimensional
curve vertex and numerical eccentricity are calculated by least square
fit. To objectivize the accuracy of the obtained model cornea, the model
cornea is compared with to the accuracy of the reproducibility . Five
eyes are being measured and analyzed three times each.
Results: The reproducibility error is larger than the difference
between model and original data.
Conclusion: The proposed method allows a unique determination of
the numerical eccentricity of the optical part of the cornea. This can
be used for further customized refractive surgery.