The recent article by Scholz et al. describes the-change in curvature of the anterior corneal surface with age. Still remaining is the basis of our understanding of how we mathematically model the human cornea.The Q asphericity coefficient mathematically describes the rate; of curvature change of the cornea from its center to the periphery and specifies the type of conicoid that best describes that cornea. Traditionally, the Q value calculated at axis 90 ignores the other axes and thus assumes that the other axes reflect rotational symmetry about axis 90. The slope measurement is customarily defined as the derivative of the function whose graph is a given curve evaluated at a designated point.
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