PURPOSE: To prevent asthenopia and near sight as caused by viewing a personal computer or the like from the closest distance, ophtalmopathy or the like by gazing at a harmful light beam by using a glasses lens so arranged to combine OA glass as glasses exclusively for preventing the harmful light beam with a convex lens.

CONSTITUTION: A glasses lens so arranged to combine OA glass 7 as glasses exclusively for preventing a harmful light beam with a convex lens 6 is used. Here, visible light 8 (100%) emitted from a display of a personal computer or the like is reduced to the visible light 9 (50%) by the OA glass 7 and moreover, ultraviolet rays or the like as harmful rays are prevented by the OA glass 7. Drop in vision in nearsightedness or the like as caused by gazing from the closest distance can be prevented by using the convex lens 6 corrected lower so that lenses of eyeballs will not become thicker as when viewing in the closest range to allow viewing normally.