(under subclass 83) Subject matter wherein multifocal lenses can be rotated in the lens rims around an axis perpendicular to the surface of the lenses so as to bring any desired power sector into the field of vision.
(1) Note. Each lens may be revolved separately and independently of the other or the lenses may be simultaneously rotated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
49, for rotatable mounts for polarized lens elements.
