Progressive multifocal ophthalmic lens with fast power variation

The lens of one of the preceding claims, characterized in that at a point located on a half-circle of 20 mm radius centered on the geometric center in the upper part of the lens, and which has a cylinder equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region, the ratio of the cylinder gradient to said difference is between 0.03 and 0.11 mm−1.

The lens of one of the preceding claims, characterized in that at a point located on a half-circle of 20 mm radius centered on the geometric center in the lower part of the lens, and which has a cylinder equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region, the ratio of the cylinder gradient to said difference is between 0.05 and 0.014 mm−1.

The lens of one of the preceding claims, characterized in that the ratio of

• the maximum cylinder gradient on the two points located on a half-circle of 20 mm radius centered on the geometric center in the lower part of the lens, and which have a cylinder equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region, on the one hand, to
• the minimum cylinder gradient on the two points located on a half-circle of 20 mm radius centered on the geometric center in the upper part of the lens, and which have a cylinder equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region, on the other hand, is less than 2.

The lens of one of the preceding claims, characterized in that, for a point located on a 20 mm radius circle centered on the geometric center, and whose mean sphere is greater than the minimum mean sphere Smin by an amount equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region, the ratio of the sphere gradient to said difference is between 0.015 and 0.07 mm−1.

The lens of one of the preceding claims, characterized in that the angle from which two points located on a half-circle of 20 mm radius centered on the geometric center of the lens in the upper part of the lens and which have a cylinder equal to half the difference (Smax−Smin) between the maximum and minimum values of the mean sphere in said region are seen from said center is at least equal to twice the angle from which two points located on a half-circle of 20 mm radius centered on the geometric center of the lens in the lower part of the lens and which have a cylinder equal to half said difference (Smax−Smin) are seen from said center.