SPECTACLE LENS DESIGN METHOD

PROBLEM TO BE SOLVED: To provide a spectacle lens design method which enables optical performance and thinness of a lens to be satisfactorily balanced.SOLUTION: The method for designing a spectacle lens which comprises a first area 22 where a rotation angle of an eyeball formed at a lens center part falls within the range of 0-30 degrees, a second area 24 formed outside the first area, where the rotation angle falls within the range of 45 degrees or less and a third area 26 outside the second area and in which optical performance to be satisfied in the first area and the second area respectively is regulated, includes: (a) a base curve setting step for setting a base curve value by simulating optical performance with a spherical design on the assumption that all bending faces have spherical shape; and (b) an aspherical shape setting step for, among a plurality of parameters included in an expression of an aspherical surface for specifying the bending face shape of an aspherical surface, calculating an apex radius of curvature using the base curve value and simulating optical performance using an expression of an aspherical surface on which a numerical value of the apex radius of curvature is reflected, so as to set a numerical value of other parameters.SELECTED DRAWING: Figure 1 【課題】光学性能とレンズの薄さとを良好にバランスさせることが可能な眼鏡用レンズの設計方法を提供する。【解決手段】レンズ中心部に形成された眼球の回旋角が０度〜３０度の範囲の第１領域２２と、第１領域の外側で回旋角が４５度以下の範囲に形成された第２領域２４と、第２領域の外側の第３領域２６と、を有し、第１領域及び第２領域にそれぞれ満たすべき光学性能を規定した眼鏡用レンズの設計方法であって、(ａ)屈曲面が何れも球面形状と仮定した球面設計にて光学性能のシミュレーションを行い、ベースカーブの値を設定するベースカーブ設定ステップと、(ｂ)非球面の屈曲面形状を特定するための非球面の式に含まれる複数のパラメータのうち、頂点曲率半径を前記ベースカーブの値を用いて算出し、この頂点曲率半径の数値を反映させた非球面の式を用いてシミュレーションを行い、残りのパラメータの数値を設定する非球面形状設定ステップと、を備えている。【選択図】 図１