Patent ID: 8529059

Claim:
A method of manufacturing an eyeglass lens of multilayered structure having plural films including a polarizing film, comprising: after forming two or more layers of films comprising at least a polarizing film in a laminating step of forming the plural films, or after the laminating step, measuring a thickness of one or more of the films included in a laminate that has been formed; in case that the film thickness that has been measured falls outside a predetermined measurement range, conducting a film thickness adjusting step in which the film that has been formed is removed and a new film is formed, or the thickness of the film that has been formed is changed; and not conducting the film thickness adjusting step when the film thickness that has been measured falls within the predetermined reference range, wherein the measuring of a film thickness comprises: a reflection spectrum measuring step in which a reflection spectrum is obtained by irradiating the laminate with a measurement beam and receiving a light reflected from the laminate; a film thickness calculating step in which the thickness of the film being measured is calculated based on the reflection spectrum obtained; and in the reflection spectrum measuring step, a polarizing element is disposed between an light emission element irradiating the measurement beam, and/or a light-receiving element receiving the reflected light, and the laminate; and the polarizing element is disposed so as to change an amplitude of the reflection spectrum obtained relative to an amplitude of a reflection spectrum obtained in a state where the polarizing element is not disposed; wherein the polarizing element is disposed so as to increase the amplitude of the reflection spectrum obtained relative to an amplitude of a reflection spectrum obtained in a state where the polarizing element is not disposed, and among films included in the plural films, a difference between a refractive index for omnidirectional light in a visible light region of the polarizing film and that of the film adjacent to the polarizing film is equal to or less than 0.05.