Patent ID: 11874529
Assignee: BRIEN HOLDEN VISION INSTITUTE LIMITED
Field: Optics (Instruments)
Classification: CPC G  A | IPC A  G

Claim 0:
1. An ophthalmic lens comprising:
an optical zone comprising:
a central portion having a first power profile,
a peripheral portion having a second power profile; and
a primary area having a third power profile containing at least a primary optical power that is less positive than the first and second power profiles,
wherein the primary area separates the central portion and peripheral portion such that the primary area forms an annulus,
wherein the first power profile of the central portion progressively transitions between more negative and more positive powers with at least a first step, the first step bounded by a first junction and a second junction, the first power profile having a first change in the rate of change of power with respect to radial distance over the first junction and a second change in the rate of change of power with respect to radial distance over the second junction,
wherein the second power profile of the peripheral portion progressively transitions between more negative and more positive powers with at least a second step, the second step bounded by a third junction and a fourth junction, the second power profile having a third change in the rate of change of power with respect to radial distance over the third junction and a fourth change in the rate of change of power with respect to radial distance over the fourth junction, and
wherein the first power profile of the central portion, the primary area, and the second power profile of the peripheral portion are substantially axially symmetric.