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In this paper,we derive a nonlinearequation of corneal asphericity (Q) usingthe tangential radius of curvature (rt) on every semi-meridian. We
transform the nonlinear equation into the linear equation and then obtain theQ-value of cor-neal semi-meridianby the linear regression method.We find the 360
semi-meridional variation rule of theQ-value us-ing
polynomial function. Furthermore, we construct a new 3D corneal model and
present a more realistic model of shape of the anterior corneal surface.