Multifocal correction providing improved quality of vision
This invention describes strategies and devices for improving the visual experience while expanding the depth of field of presbyopic and pseudophakic patients. The invention describes strategies and devices for providing improved image quality and improved visual quality of patients employing simultaneous vision bifocal, trifocal or multifocal corrections or monovision. The invention describes strategies and devices for reducing the visibility of the defocused part of the retinal image generated by simultaneous vision bifocal and multifocal ophthalmic corrections and monovision. The invention describes strategies and devices that employ control of spherical aberration or other similar asphericities to reduce the visibility of defocused ghost images. The invention describes strategies and devices that ensure that negative defocus is always coupled with negative spherical aberration (or similar asphericity), and that positive defocus is always coupled with positive SA (or similar asphericity) as a means to reduce the visibility of defocused ghostimages.
1. A corrective optical lens adapted to move with and change the power of a user's eye, comprising:
a first radially extending optical zone having a first power that, when combined with the power of the user's eye, is adapted to result in a first net power that increases as the radius of the first radially extending optical zone increases; and
a second radially extending optical zone having a second power that, when combined with the power of the user's eye, is adapted to result in a second net power that decreases as the radius of the second radially extending optical zone increases;
wherein the first net power is greater than the second net power; and
wherein the sizes and powers of the first and second radially extending optical zones are adapted to attenuate visibility to the user of defocused light.
2. The corrective optical lens of claim 1 , wherein the first radially extending optical zone is separated in a radial direction from the second radially extending optical zone.
3. The corrective optical lens of claim 1 , wherein the first radially extending optical zone is separated in an axial direction from the second radially extending optical zone.
4. The corrective optical lens of claim 1 , wherein the first power is achieved at least partially with at least one of refractive or defractive optics.
5. The corrective optical lens of claim 1 , wherein the second power is achieved at least partially with at least one of refractive or defractive optics.
6. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises a bifocal lens.
7. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises a trifocal lens.
8. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises a multifocal lens.
9. The corrective Optical lens of claim 1 , wherein the corrective optical lens comprises a contact lens (CL).
10. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises an intraocular lens (IOL).
11. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises a cornea.
12. The corrective optical lens of claim 1 , wherein the corrective optical lens comprises a corneal in-lay.
13. The corrective optical lens of claim 1 , wherein the first radially extending optical zone extends radially outward to a first diameter, and the second radially extending optical zone extends radially outward from a second diameter that is at least as large as the first diameter.
14. The corrective optical lens of claim 1 , wherein the second radially extending optical zone extends radially outward to a first diameter, and the first radially extending optical zone extends radially outward from a second diameter that is at least as large as the first diameter.
15. The corrective optical lens of claim 1 , wherein at least one of the first radially extending optical zone or the second radially extending optical zone defines an approximately annular shape.
16. The corrective optical lens of claim 1 , wherein the amount of power change across either the first radially extending optical zone or across the second radially extending optical zone can be defined by a wavefront proportional to a wavefront having RMS magnitude of approximately 0.1 to approximately 0.4 microns for a 6 millimeter diameter pupil.
17. A pair of corrective optical lenses adapted to move with and change the power of a user's first and second eyes, comprising:
a first corrective optical lens for use with the first eye of the user, the first corrective optical lens including a first radially extending optical zone having a first power that, when combined with the power of the user's first eye, is adapted to result in a first net power that increases as the radius of the first radially extending optical zone increases; and
a second corrective optical lens for use with the second eye of the user, the second corrective optical lens including a second radially extending optical zone having a second power that, when combined with the power of the user's second eye, is adapted to result in a second net power that decreases as the radius of the second radially extending optical zone increases;
wherein the first net power is greater than the second net power; and
wherein the sizes and powers of the first and second radially extending optical zones' are adapted to attenuate visibility to the user of defocused light.
18. A method of adapting an optical lens to have more than one power, comprising the steps of:
forming a first radially extending optical zone of the lens to have a first power that, when combined with the power of a user's eye, is adapted to result in a first net power that increases as the radius of the first radially extending optical zone increases;
forming a second radially extending optical zone of the lens to have a second power that, when combined with the power of the user's eye, is adapted to result in a second net power that decreases as the radius of the second radially extending optical zone increases;
adapting the first radially extending optical zone and the second radially extending optical zone to cause the first net power to be greater than the second net power; and
adapting the sizes and powers of the first and second radially extending optical zones to attenuate visibility to the user of defocused light.
19. The method of claim 18 , wherein the optical lens comprises a cornea, and wherein at least one of the steps is accomplished using laser-assisted surgery.
20. The method of claim 18 , wherein the step of adapting the sizes and powers of the first and second radially extending optical zones to attenuate visibility to the user of defocused light, further comprises at least one of the following steps:
shaping an optical profile of the lens;
manipulating a zone of separation in the lens;
manipulating a refractive index of the lens.