Multifocal (351/168) Patents (Class 351/FOR110)

Gradually varying focal power (351/169) (Class 351/FOR111)

With prismatic segment (351/170) (Class 351/FOR112)

Three or more foci (351/171) (Class 351/FOR113)

Multiple elements (351/172) (Class 351/FOR114)

There are no patents to show for this class.