Non-progressive multifocal lens with large near/intermediate area
AssigneeEssilor International
InventorJon TORREY
Life of this patent
Estimating the term…
Abstract
A non-progressive ophthalmic lens used in eye frames is provided with at least two distinct viewing areas. A very large lower area (lower relative to the face and eyes of the wearer) is provided with near to intermediate range vision correction prescription. A smaller, top portion of the lens is provided with distance range viewing correction prescription or zero power. In order to reduce image jump, the lenses are positioned such that the major axis of the base lens intersects and ends on the major axis of the supplementary lens, and both major axes lie in the same vertical plane. The two lens segments meet at a lined or blended intersection to minimize consumption of non-optically viewable space.
Claims25
A multifocal spectacle lens comprising:
- a base lens dimensioned for near-to-intermediate range viewing, the base lens having a base lens major axis;
- and
- a supplementary lens dimensioned for distance range viewing, the supplementary lens having a supplementary lens major axis;
- wherein the base lens and the supplementary lens are positioned to form the spectacle lens such that the base lens major axis intersects and ends on the supplementary lens major axis.
A method of providing multifocal spectacle lenses to a wearer comprising:
- selecting a base lens dimensioned for the wearer's viewing of near to intermediate images;
- selecting a supplementary lens dimensioned for the wearer's viewing of distance range images;
- and
- positioning the supplementary lens at the top of the spectacle lens and the base lens at the bottom of the spectacle lens such that a major axis of the base lens intersects and ends on a major axis of the supplementary lens.
Dependencies are inferred from the claim text.