| 摘要 |
A contact lens (30) having a smooth surface (55, 65) is made through the use of a computer implementing a spline approximation of corneal topography (145). Piecewise polynomials approximating the corneal topography (145) have equal first and second derivatives where they join. A curve (50) representing the central optical portion of the lens and the piecewise polynomial (70) adjacent to the central optical portion curve (50) have an equal first derivative where they join. A contact lens (30) is cut corresponding to the smooth surface (55, 65) defined by the piecewise polynomials.
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