(under subclass 159) Subject matter wherein one surface of a lens is shaped so as to give a prescribed image-size correction (magnification) without refractive power.
(1) Note. The modification here may comprise the addition of refractive power by suitably grinding the second surface of the lens. This subclass also provides for two lenses (one for each eye), one or both or which may be within the scope of the above definition.
SEE OR SEARCH THIS CLASS, SUBCLASS:
160, for combinations of contact lenses and spectacle glasses.
