To obtain and evaluate an optimum optical properties of a spectacle lens which corresponds to the state, in which a spectacle lens is worn by the wearers.
Three dimensional shape data of the spectacle lens, containing a measured value of a three-dimensional measurement device which measures the surface shape of the spectacle lens, parameters of the state, in which the spectacle lens is worn, such as the distance from a center of rotation, and material parameters, such as the refractive index of the spectacle lens are input into a computer that calculates the optical properties of the spectacle lens. Optical model of the state, in which the spectacle lenses are worn, is constructed by the computer based on these input data; and by means of this optical model, optical properties at each position on the spectacle lens related to the principal beam, or light flux containing the principal beam in the direction of the line of vision that passes through the center of turning of eyeball are calculated. The calculated results are output to a printer, etc.
Toru Yui
Hitoshi Kiyono
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