Diffractive lenses for vision correction
First Claim
1. An ophthalmic lens comprising:
- a lens body having first and second surfaces;
a first diffractive structure for splitting light of different wavelengths into two or more diffractive orders to different focal distances or ranges;
a second diffractive structure for diffracting light into a plurality of different diffractive orders to a common focal distance or a substantially common focal distance, in which said first and second diffractive structures are located on the same or different ones of said first and second surfaces; and
said first and second diffractive structures in combination provide at least near and distance vision correction.
2 Assignments
0 Petitions
Accused Products
Abstract
Diffractive lenses for vision correction are provided on a lens body having a first diffractive structure for splitting light into two or more diffractive orders to different focal distances or ranges, and a second diffractive structure, referred to as a multiorder diffractive (MOD) structure, for diffracting light at different wavelengths into a plurality of different diffractive orders to a common focal distance or range. In a bifocal application, the first and second diffractive structures in combination define the base power for distance vision correction and add power for near vision correction of the lens. The first and second diffractive structures may be combined on the same surface or located on different surfaces of the lens. An optical element, such as a substrate or coating, may be integrated along one or both surfaces of the lens to provide the lens with smooth outer surface(s).
-
Citations
38 Claims
-
1. An ophthalmic lens comprising:
-
a lens body having first and second surfaces; a first diffractive structure for splitting light of different wavelengths into two or more diffractive orders to different focal distances or ranges; a second diffractive structure for diffracting light into a plurality of different diffractive orders to a common focal distance or a substantially common focal distance, in which said first and second diffractive structures are located on the same or different ones of said first and second surfaces; and said first and second diffractive structures in combination provide at least near and distance vision correction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method for providing a bifocal ophthalmic lens having a base power and an add power comprising the steps of:
-
selecting a first diffractive structure for the lens for diffracting light into a plurality of different diffractive orders to a common focal distance or or a substantially common focal distance in accordance with needed base power of the lens; and selecting a second diffractive structure for the lens for splitting light into two or more diffractive orders to different focal distances or ranges in which the base power for distance vision correction and add power for near vision correction are in accordance with a combination of said first and said second diffractive structures. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
-
-
36. An optical element comprising:
-
a lens body having first and second surfaces; a first diffractive structure for splitting light into two or more diffractive orders to different focal distances or ranges; a second diffractive structure for diffracting light into a plurality of different diffractive orders to a common focal distance or a substantially common focal distance, in which said first and second diffractive structures are located on the same or different ones of said first and second surfaces; and said first diffractive structure and said second diffractive structure in combination provide a plurality of different focal distances or ranges for vision correction at different distances or ranges. - View Dependent Claims (37, 38)
-
Specification