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

Claim 8:
9. An ophthalmic lens comprising:
an optical zone comprising:
a primary area with a primary optical power;
at least two secondary areas comprising:
a first secondary area with at least a first optical power and a second secondary area with at least a second optical power,
wherein at least one of the secondary areas is peripheral to the primary area, and the at least first and second optical powers are more positive than the primary optical power,
wherein there is a first power transition from the primary optical power to the at least first optical power comprising at least a first step, a first junction, and a first transition region, and a second power transition from the primary optical power to the at least second optical power comprising at least a second step, a second junction, and a second transition region, the steps not including the primary optical power,
wherein for the at least first step and the at least second step, the magnitude of the rate of change of the power transition decreases over a junction located at the beginning of the step and then increases over a junction located at the end of the step,
wherein there is a power transition within the primary area comprising one or more steps, such that within the primary area the optical power transitions from the primary optical power to a more positive power before returning to the primary optical power,
wherein within at least one step the rate of change of the power transition reverses from positive to negative, and
wherein the primary area and the at least two secondary areas are substantially axially symmetric.