Multifocal lens having an optical add power progression, and a system and method of providing same
An apparatus, system and method including an ophthalmic lens having an optic with an anterior surface, a posterior surface, and an optical axis. The ophthalmic lens further includes a first region having a first optical power and a second region having a second optical power. The ophthalmic lens further includes a third region having an optical power that progresses from the first optical power to the second optical power. The progression may be uniform or non-uniform. Each of the first, second and progression optical power may include a base power and an optical add power. Each of the first, second and progression regions may provide a first focus, a second focus and a plurality of third foci, respectively.
1. An ophthalmic lens, comprising:
an optic having a vertical diameter and a horizontal diameter, comprising:
a first region having a first optical power for providing a first focus, wherein the first region comprises an uppermost portion of said optic and wherein the first optical power is constant along each horizontal cross section in the first region;
a second region having a second optical add power different from the first optical power for providing a second focus, wherein the second region comprises a lowermost portion of said optic and wherein the second optical add power is constant along each horizontal cross section in the second region; and
a third region having at least the first optical power and a plurality of third optical add powers comprising a progression of optical add powers increasing along the vertical diameter from the first optical power to the second optical add power, wherein the third region comprises a central portion of said optic, wherein an uppermost boundary of the third region is above a center of said optic and a lowermost boundary of the third region is below the center of said optic, and wherein each of the plurality of third optical add powers is constant along a horizontal cross-section in the third region parallel to the horizontal diameter.
2. The lens of claim 1 , wherein the uppermost portion comprises at least the uppermost 25% along the vertical diameter of said optic.
3. The lens of claim 1 , wherein the uppermost portion comprises the uppermost 37.5% along the vertical diameter of said optic in the complete optic.
4. The lens of claim 1 , wherein the second focus comprises a near vision focus.
5. The lens of claim 1 , wherein the lowermost portion comprises at least the lowermost 25% along the vertical diameter of said optic.
6. The lens of claim 1 , wherein the central portion comprises a centralmost of at least 25% along the vertical diameter of said optic.
7. The lens of claim 1 , wherein the central portion comprises a centralmost of at least 37.5% along the vertical diameter of said optic.
8. The lens of claim 1 , further comprising at least one haptic that at least partially supports said optic within a subject eye.
9. The lens of claim 1 , wherein the progression of optical add powers in the third region is continuous.
10. The lens of claim 1 , wherein the progression of optical add powers in the third region is step-wise.
11. The lens of claim 1 , wherein the progression of optical add powers in the third region is uniform.
12. The lens of claim 1 , wherein the progression of optical add powers in the third region is non-uniform.
13. The lens of claim 1 , wherein the third region has a constant height measured along a vertical diameter of the optic.
14. The lens of claim 1 , wherein the third region is asymmetric with respect to the center of the optic.