Lens for optical treatment

Abstract

A method for treating progression of a refractive disorder in a human eye. The method includes the steps of producing a first image on a retina of the human eye and producing a second image to generate a defocus.

We claim: 
     
       1. A method for retarding the progression of myopia or hyperopia in a human eye, the method comprising:
 (a) providing a Fresnel concentric multi-focal lens comprising primary optical zones having a primary refractive power and secondary optical zones having at least one secondary refractive power; and   (b) correcting the myopia or hyperopia with the primary refractive power and generating at least one defocus with the secondary refractive power,   
       wherein the primary optical zones enable near and distant objects to be viewed; and the secondary optical zones generate myopic defocus to retard myopia or generate hyperopic defocus to retard hyperopia. 
     
     
       2. The method of  claim 1 , wherein:
 the step (b) comprises focusing a first stream of light rays of an object onto a retina of the human eye through the primary optical zones to correct the myopia and focusing a second stream of light rays of the object in front of the retina through the secondary optical zones to generate at least one myopic defocus.   
     
     
       3. The method of  claim 1 , wherein:
 the step (b) comprises focusing a primary stream of light rays of an object onto a retina of the human eye through the first optical zones to correct the hyperopia and focusing a second stream of light rays of the object behind the retina through the secondary optical zones to generate at least one hyperopic defocus.   
     
     
       4. The method of  claim 1 , wherein the step (a) comprises prescribing a Fresnel concentric bi-focal lens to produce a defocus in step (b). 
     
     
       5. The method of  claim 1 , wherein the step (a) comprises providing a Fresnel concentric multi-focal lens producing two or more defocuses in step (b). 
     
     
       6. The method of  claim 1 , wherein the Fresnel concentric multi-focal lens is a concentric bi-focal lens. 
     
     
       7. A concentric multi-focus lens for retarding the progression of myopia in a human eye, the lens comprising:
 a first lens side;   a primary optical zone on the first lens side having a first curvature configured to form a primary refractive power, wherein the primary refractive power is configured to correct the myopia; and   a secondary optical zone on the first lens side having at least one second curvature configured to form at least one secondary refractive power, the at least one second curvature being different and non-continuous relative to the first curvature, wherein the secondary refractive power is configured to generate at least one myopic defocus to retard myopia.   
     
     
       8. The lens of claim 7, the primary optical zone is configured to focus a first stream of light rays of an object onto a retina of the human eye to correct the myopia, and the secondary optical zone is configured to focus a second stream of light rays of the object in front of the retina to generate at least one myopic defocus. 
     
     
       9. The lens of claim 7, wherein the lens is a bi-focal lens configured to produce a single defocus to retard myopia. 
     
     
       10. The lens of claim 7 comprising a third optical zone having a third refractive power configured to generate another myopic defocus to retard myopia. 
     
     
       11. The lens of claim 7, wherein the lens is configured to produce two or more defocuses to retard myopia. 
     
     
       12. The lens of claim 7, wherein the primary optical zone is configured to generate a focused image in a central optic zone, and the secondary optical zone is configured to generate a defocused image in the central optic zone at a spaced distance from the focused image. 
     
     
       13. The lens of claim 7, wherein the lens is a contact lens. 
     
     
       14. The lens of claim 7, wherein the transition between the primary optical zone and the secondary optical zone is progressive. 
     
     
       15. A lens for retarding the progression of myopia in a human eye, the lens comprising:
 a first lens side;   a primary optical zone on the first lens side having a first curvature configured to form a primary refractive power, wherein the primary refractive power is configured to correct the myopia during usage of the lens; and   a secondary optical zone on the first lens side having at least one second curvature configured to form at least one secondary refractive power,   wherein the at least one second curvature is different and non-continuous relative to the first curvature,   wherein the secondary refractive power is configured to generate at least one myopic defocus to retard myopia during usage of the lens, and   wherein at least part of the secondary optical zone is formed concentrically about at least part of the primary optical zone.   
     
     
       16. The lens of claim 15, wherein during use for retarding the progression of myopia, the primary optical zone is configured to focus a first stream of light rays of an object onto a retina of the human eye to correct the myopia, and the secondary optical zone is configured to focus a second stream of light rays of the object in front of the retina to generate at least one myopic defocus. 
     
     
       17. The lens of claim 15, wherein the lens is a bi-focal lens configured to produce a single defocus to retard myopia. 
     
     
       18. The lens of claim 15 comprising a third optical zone having a third refractive power configured to generate another myopic defocus to retard myopia, wherein at least part of the third optical zone is formed concentrically about at least part of the secondary optical zone. 
     
     
       19. The lens of claim 15, wherein the lens is configured to produce two or more defocuses to retard myopia. 
     
     
       20. The lens of claim 15, wherein the primary optical zone is configured to generate a focused image in a central optic zone, and the secondary optical zone is configured to generate a defocused image in the central optic zone at a spaced distance from the focused image. 
     
     
       21. The lens of claim 15, wherein the lens is a contact lens. 
     
     
       22. The lens of claim 15, wherein the transition between the primary optical zone and the secondary optical zone is progressive. 
     
     
       23. A concentric multi-focus contact lens for retarding the progression of myopia in a human eye, the lens comprising:
 a first lens side;   a centrally located primary optical zone on the first lens side having a first curvature configured to form a primary refractive power,
 wherein the primary refractive power is configured to correct myopia by generating a focused image in a central optic zone of the human eye during usage of the lens; and 
   a secondary optical zone on the first lens side having at least one second curvature configured to form at least one secondary refractive power,
 wherein the at least one second curvature is different and non-continuous relative to the first curvature, 
 wherein at least part of the second optical zone is concentrically located about at least part of the centrally located primary optical zone, and 
 wherein the secondary refractive power is configured to generate at least one defocused image in the central optic zone of the human eye at a spaced distance from the focused image during usage of the lens to retard myopia. 
   
     
     
       24. The lens of claim 23, wherein the transition between the primary optical zone and the secondary optical zone is progressive.