Method of optical treatment
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.
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.