Method for evaluating eyeglass lens, method for designing eyeglass lens, and method for manufacturing eyeglass lens

摘要

An optical system is configured using a coordinate system such that an origin 1 is placed at a middle point of centers of rotations 1L and 1R of both eyeballs 10L and 10R, and an object is specified in a viewing direction from the origin 1. A reference value of an angle of convergence θCH0 is calculated with lines of fixations 13L0 and 13R0, a viewing direction of the lines of fixation being an object 12 which is placed at an intersection point at which the lines of fixations 13L0 and 13R0 cross after passing through design reference points 11PL and 11PR of eyeglass lenses 11L, 11R. The angle of convergence is calculated with the lines of fixations which extend to an object evaluation point in an arbitrary viewing direction and pass the eyeglass lenses, and a convergence aberration is calculated from a difference between the angle of convergence and the reference value of the angle of convergence θCHO.

主权项

1. A method of evaluating eyeglass lenses comprising:
setting an optical system including an object, left and right eyeglass lenses and both eyeballs, wherein the object is specified by a visual direction from a midpoint of rotations of both of the eyeballs; calculating a reference value of an angle of convergence with lines of fixation for which a fixation point of the object is set as a viewing direction, the fixation point being an intersection point at which the lines of fixation cross with each other after passing through design reference points of the left and right eyeglass lenses; calculating an angle of convergence with the lines of fixation, the lines of fixation extending to an object evaluation point in an arbitrary viewing angle and passing through the left and right eyeglass lenses; calculating a convergence aberration from a difference between the angle of convergence and the reference value of the angle of convergence; and evaluating the eyeglass lenses using the convergence aberration.