| abstract |
The present invention provides a lens (10) having a plurality of vision areas. The plurality of areas including a first vision area (12), a second vision area (14) surrounding the first vision area, and a third vision area (16) surrounding the second vision area. The first vision area having a first power, the second vision area having a range of powers, and the third vision area having a second power distinct from the first power. One of the first, second and third vision areas having an aspheric surface designed to provide a monotonic gradient in power and the other areas having either spherical surfaces to provide single power values or aspheric surfaces designed to correct optical aberrations within these single power areas. |