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06/25/09 - USPTO Class 623 | 1 views | #20090164008 | Prev - Next | About this Page

Lens surface with combined diffractive, toric, and aspheric components

Title: Lens surface with combined diffractive, toric, and aspheric components

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20090164008, Lens surface with combined diffractive, toric, and aspheric components.

What is claimed is:

1. An intraocular lens (IOL), comprising an optic comprising an anterior surface and a posterior surface, a plurality of diffractive zones disposed on one of said surfaces, wherein said surface having the diffractive zones exhibits a base profile characterized by a combination of asphericity and toricity.

2. The IOL of claim 1, wherein said optic provides a far focus and a near focus.

3. The IOL of claim 2, wherein said far focus provides an optical power in a range of about 16 D to about 32 D.

4. The IOL of claim 3, wherein said near focus provides an add power in a range of about 1 D to about 6 D.

5. The IOL of claim 1, wherein said anterior surface comprises said diffractive structures and said asphericity and toricity.

6. The IOL of claim 1, wherein a profile of said surface is characterized by the following relation: sag(Ravrg,r,θ)=diffractive(Rave,r)+toric(Rave,r,θ)+asph(Rave,r), wherein, sag represents a sag of the surface along an optical axis of the optic at a radial distance r from a center of the surface at a meridian angle θ, where Ravrg represents a base radius of curvature of average meridian, and wherein, diffractive(Ravrg,r)=zrad−√{square root over (Rrad2−r2)}, wherein, zrad and Rrad denote, respectively, a radius of curvature of a diffractive zone extending through the radial distance r and an axial location of a curvature center of that zone, and wherein, toric  ( R avrg , r , θ ) = ( c x  cos 2  θ + c y  sin 2  θ )  r 2 1 + 1 - ( 1 + k x )  c x 2  r 2  cos θ 2 - ( 1 + k y )  c y  r 2  sin 2  θ , wherein, cx and cy represent toric curvatures along two principal meridians of the surface and kx and ky represent toric conic constants along the two principal meridians, and wherein, asph  ( R avrg , r ) = cr 2 1 + 1 - ( 1 + k )  c 2  r 2 , and wherein c = 1 R avrg , and wherein k represents a spherical conic constant.

7. The IOL of claim 6, wherein zrad is defined in a Cartesian coordinate (x,y,z), where z is along the optical axis, in accordance with the following relation: z rad = x in 2 + z in 2 - x out 2 - z out 2 2  ( z in - z out ) , wherein xin and zin represent, respectively, x and z coordinates of an inner boundary of the diffractive zone and xout and zout represent, respectively, x and z coordinates of an outer boundary of the diffractive zone.

8. The IOL of claim 7, wherein Rrad is defined in the Cartesian coordinates in accordance with the following relation: Rrad=√{square root over ((zin−zrad)2+xin2)}.

9. The IOL of claim 8, wherein a magnitude of Ravrg is in a range of about 12 mm to about 120 mm.

10. The IOL of claim 9, wherein a magnitude of cx is in a range of about 0.008 mm−1 to about 0.08 mm−1 and a magnitude of cy is in a range of about 0.008 mm−1 about 0.08 mm−1.

11. The IOL of claim 10, wherein kx is in a range of about −3000 to about −12 and ky is in a range of about −3000 to about −12.

12. The IOL of claim 11, wherein k is in range of about −3000 to about −12.

13. The IOL of claim 1, wherein said diffractive zones comprise a plurality of diffractive structures separated from one another by a plurality of step heights.

14. The IOL of claim 13, wherein a radius of curvature of a diffractive zone along a meridian characterized by an angle θ (Rdθ) and a radius of curvature of a base profile associated with that diffractive zone (Rbθ) are related in accordance with the following relation: ( n 1 - n 2 )  ( 1 R d θ - 1 R b θ ) = Constant .

15. The IOL of claim 14, wherein said Constant is in a range of about 0 D to about 4 D.

16. The IOL of claim 1, wherein said anterior surface includes said diffractive zones.

17. The IOL of claim 16, wherein said posterior surface exhibits a spherical profile.

18. A diffractive ophthalmic lens, comprising an optic having an anterior surface and a posterior surface, wherein at least one of said surfaces exhibits a profile characterized by a combination of diffractive, aspheric and toric components.

19. The ophthalmic lens of claim 18, wherein said lens provides a far-focus optical power in a range of about 16 D to about 32 D.

20. The ophthalmic lens of claim 19, wherein said lens provides a near-focus power characterized by an add power in a range of about 1 D to about 6 D.

Brief Patent Description - Full Patent Description - Patent Claims

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Previous Patent Application:
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Industry Class:
Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor

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