Method for predicating difficulty in formation of aspherical glass molded lens and method for designing lens system containing aspherical glass molded lens

The present invention provides an aspherical glass molded lens forming Difficult prediction method used to predict MO aspheric lens molded Difficulty having no cluethe in the past, and becomes a clue required to change the design shape of the aspherical lens MO. According to the present invention, the used to predict the the R1 surface and R2 face of at least one degree of difficulty as performance aspherical surface represented by the following formula (1), rotationally symmetric aspherical surface of the aspherical molded glass lens molded aspheric glass moldBuilt the lens forming Difficult prediction method by the aspherical equation of the the R1 surface and R2 face an order and micro, which were calculated the slope of the the R1 surface and R2 surface, based on the slope of the surface with the above-mentioned R1 and R2 surfaceany one of the slope is divided by the other, thereby obtaining the slope of the ratio of formula to determine molding Difficulty.