Patent ID: 8256895
Filing Date: 2012-09-04
Classification: G02C

Abstract:
1. A series of progressive lenses, each having a progressive optical surface comprising: a geometrical center of millimetric coordinates x=0, y=0; a far vision portion which is located at the upper part of the lens, which has a far vision correction and which comprises a far vision reference point of millimetric coordinates x=0, y=+8; a near vision portion which is located at the lower part of the lens and which has a near vision correction; and an intermediate portion connecting the far vision and near vision portions, wherein the progressive optical surface of each progressive lens of the series has a power addition A which is defined as the power difference between the far vision and near vision portions and which is selected within a range of 0.50 diopters to 4.00 diopters, a basecurve selected within a range of 0.5 diopters to 10.5 diopters, and a refractive index selected within a range of at least 1.498 to 1.74, and wherein the progressive optical surface of each progressive lens of the series has astigmatism values not exceeding 0.5 diopters at least on a segment whose extremities thereof are defined by millimetric coordinates x=−X, y=+8 and x=+X, y=+8, with X=40.45−(7.272*A).