To provide a method for designing a spectacle lens favorably satisfying desired prescription frequency and aberration characteristics over a wide viewing range while assuring optical continuity of transmission frequency distribution.
A method for interpolating a shape of a surface to be corrected between control lines using a prescribed interpolation method comprises the steps of: setting target transmission frequency distribution on the basis of prescription, calculating remaining error distribution by temporarily designing a spectacle lens having provisional transmission frequency distribution; setting control lines on the surface to be corrected; calculating an optical correction amount at each control point on each control line; defining a closed curve obtained by connecting control points on neighbouring control lines; defining a primary approximate curve on each closed curve on the basis of each control point after correction amount calculation; adjusting a correction amount of each control point so that each control point is on the primary approximate curve; defining a secondary approximate curve on each control line on the basis of each control point after correction amount adjustment; and converting an optical correction amount represented by each secondary approximate curve into an aspherical addition amount and adding the converted aspherical addition amount onto each control line of the surface to be corrected.
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Yoshiyuki Araki
Eihiro Oyama