(under subclass 642) Subject matter wherein the lens has a plurality of light transmitting zones or areas of different focal lengths.
(1) Note. This subject matter includes the lens plus means
to exclude light from passing through certain areas or zones while permitting light to pass through other zones or areas of the lens whereby a selection of focal length is provided.
(2) Note. See subclass 745 - (2) Note for the definition of focal length.
