METHOD FOR PREDICTING MOLDING DIFFICULTY OF ASPHERIC GLASS MOLDED LENS, AND METHOD FOR DESIGNING LENS SYSTEM INCLUDING THE ASPHERIC GLASS MOLDED LENS

PROBLEM TO BE SOLVED: To obtain a method for predicting molding difficulty which predicts the molding difficulty of an aspheric MO lens (glass molded lens) for which the key is not present so far, and becomes the key to request the change of the design shape itself of the aspheric MO lens.SOLUTION: In the method for predicting the molding difficulty of an aspheric glass molded lens in which at least one of the R1 surface and R2 surface is a rotationally symmetric aspheric surface represented by an aspheric surface expression, inclinations of the R1 surface and R2 surface are calculated respectively by differentiating once the aspheric surface expressions of the R1 surface and R2 surface, and on the basis of an expression of an inclination ratio obtained by dividing any one of the inclination of the R1 surface and the inclination of the R2 surface by the other, the molding difficulty is determined.