Ophthalmic lens including a peripheral zone having an add-power offset and a spatially-modulated optical parameter
An ophthalmic lens, comprising a central zone having at least a first power, and a peripheral zone having an add-power offset relative to the at least first power and a spatially-modulated optical parameter. In some embodiments, the central zone has a diameter in the range 2.0 to 5.0 mm. In some embodiments, the central zone is not more than 1 mm smaller than a wearer's pupil. The spatially-modulated optical parameter may include optical power, light scattering or light transmission.
1. An ophthalmic lens, comprising: a central zone having at least a first power; and a peripheral zone disposed radially outward of the central zone, the peripheral zone having an add-power offset relative to the at least first power and a smoothly varying spatially-modulated optical power profile that extends in a radially outward direction from a location radially outward of central zone, the power profile having a plurality of maxima and a plurality of minima.
2. The lens of claim 1 , wherein the central zone has a diameter of at least 3 mm.
3. The lens of claim 1 , wherein the central zone is not more than 1 mm smaller than a wearer's pupil.
4. The lens of claim 1 , wherein the central zone has a diameter of at least 2.0 mm.
5. The lens of claim 1 , wherein the central zone has a diameter in the range 2.0 to 5.0 mm.
6. The lens of claim 5 , wherein the add power offset is in the range 0.5 diopters to 5 diopters.
7. The lens of claim 1 , further comprising a transition zone between the central zone and the peripheral zone such that a power profile from an optical axis of the lens to the outer diameter of the peripheral zone varies continuously.
8. The lens of claim 1 , wherein there is a step in power between the central zone and the peripheral zone.
9. The lens of claim 1 , wherein the maxima or the minima increase as a function of radial position.
10. The lens of claim 1 , wherein the maxima have a same dioptric value as one another and minima have a same dioptric value as one another.
11. The lens of claim 1 , wherein the add power offset is in the range 0.5 diopters to 5 diopters.
12. The lens of claim 11 , wherein the peripheral zone has a base power, and power differences between the base power and each of the maxima are in the range 0.05 diopters to 2 diopters.
13. The lens of claim 1 , wherein the lens is a contact lens.
14. The lens of claim 1 , wherein the central zone has a single power.
15. The lens of claim 12 , wherein the base power is uniform across the peripheral zone.
16. The lens of claim 12 , wherein the base power increases as a function of radial position across the peripheral zone.
17. The lens of claim 1 , wherein the lens is rotationally symmetric.
18. The lens of claim 1 , wherein the lens is a hydrogel contact lens packaged in combination with a buffered saline solution containing a pharmaceutical agent that reduces the progression of myopia.
19. The lens of claim 1 , wherein the add power offset comprises a step in power.