Abstract: An object of this invention is to improve the safety. Lens bodies 2, 2a are formed integrally on the rear surface of a shield so as to avoid such a danger that the eyes may be injured due to drop or separation of the lens bodies 2, 2a.

Abstract: An object of this invention is to improve the safety. Lens bodies 2, 2a are formed integrally on the rear surface of a shield so as to avoid such a danger that the eyes may be injured due to drop or separation of the lens bodies 2, 2a.

Abstract: A plastic bifocal lens includes a lens matrix. The front and rear sides of the lens matrix each include a far-sight section and a near-sight section. The front far-sight section has curvature which is smaller than the curvature of the rear far-sight section. The front near-sight section has a curvature that is larger than the curvature of the front far-sight section. The front and rear sides of the lens matrix are coated with a coating material having a lower refractive power than a material used to form the lens matrix. The curvatures at both the front and rear sides are formed to become smooth surfaces. The smooth surfaces prevent stains from being accumulated at specific locations on the front and rear surfaces.