Contact lenses for myopic eyes and methods of treating myopia
A contact lens and a method for treating an eye with myopia is described. The contact lens includes an inner optic zone and an outer optic zone. The outer optic zone includes at least a portion with a first power, selected to correct distance vision. The inner optic zone has a relatively more positive power (an add power). In some embodiments the add power is substantially constant across the inner optic zone. In other embodiments the add power is variable across the inner optic zone. While in some embodiments the inner optic zone has a power designed to substantially eliminate lag of accommodation in the eye with myopia, in other embodiments, the add power may be higher.
1. A contact lens comprising:
an inner optic zone with a diameter that approximates or is less than a pupil diameter; and
an outer optic zone surrounding the inner optic zone, the outer optic zone having a variable power and an outer diameter greater than the pupil diameter,
wherein the inner optic zone has an add power portion relative to the negative power of the outer optic zone of between 0.5 diopters and 4 diopters inclusive, and
wherein the inner optic zone is configured to reduce or eliminate lag of accommodation by said eye when viewing at near distances.
2. The contact lens of claim 1 , wherein the inner optic zone has a diameter between 2 mm and 4 mm.
3. The contact lens of claim 1 , wherein the inner optic zone has a diameter of less than 2 mm.
4. The corneal contact lens of claim 1 , wherein the outer optic zone includes at least a portion with a third power, relatively more positive than the power of the outer optic zone, wherein the portion with a third power is distinct from the inner optic zone.
5. The corneal contact lens of claim 4 , wherein the third power is substantially equal to the power in the add power portion.
6. The corneal contact lens of claim 4 , wherein the third power is different to the power in the add power portion.
7. The corneal contact lens of claim 6 , wherein the third power is greater than the power in the add power portion.
8. The corneal contact lens of claim 1 wherein the outer optic zone includes at least two portions with power greater than the power in the add power portion, separated by a portion with the first power.
9. The corneal contact lens of claim 8 , wherein each of said at least two portions have the same power.
10. The corneal contact lens of claim 8 , wherein each of said at least two portions have different powers.
11. The corneal contact lens of claim 10 , wherein the portion with more positive power is located on the contact lens at a greater radial distance than the portion with a lesser power.