Patent ID: 7033023

Claim:
A progressive lens comprising a surface having a variable height and including a distance area and a reading area, wherein a contour defining an area of constant mean power in the distance area is an ellipse with a ratio of major axis to minor axis in the range of about 1.1 to 3.0, and mean power M over the lens surface varies according to a set of curves forming iso-mean power contours on the lens surface wherein mean power M varies along a connecting path extending from a first point in the distance area to a second point in the reading area according to a function of the form: M ⁡ ( y ) = M D + [ M R - M D D ] ⁡ [ 1 - cos ⁡ ( π ⁢ ⁢ y D - y y D - y R ) ] where M D is mean power specified at a first point (0, Y D ) in the distance area and M R is mean power specified at the second point (0, Y R ) in the reading area.