| 摘要 |
PURPOSE: The lens of eyeglasses is provided to improve the visibility by automatically focusing in a vector addition direction when a user stares at a short distance for a long time. CONSTITUTION: A left lens(10) and a right lens(20) include a first prism and a second prism. The thicknesses for the base-out areas(32) and the base-in areas(34) of the left lens and the right lens are different. The thicknesses for the base-up areas(36) and the base-down areas(38) of the left lens and the right lens are different. The function of prisms is complicatedly realized. A sight is refracted in a vector addition direction of a base-in area direction and a base-out area direction in order to be automatically focused. |
