Patent ID: 7673990
Filing Date: 2010-03-09
Classification: G02C

Abstract:
1. Individual eyeglass lens, comprising an area designed for seeing at greater distances, in particular into the infinite, hereinafter referred to as the far part, an area designed for seeing at shorter distances and especially reading distances, hereinafter referred to as the near part, and a progressive zone arranged between the far part and the near part where the power of the eyeglass lens increases from a value at a far reference point located in the far part, hereinafter referred to as the far value, to a value at a near reference point located in the near part, hereinafter referred to as the near value, along a curve running toward the nose, hereinafter referred to as the main line, whereby the vertical distance from the near reference point to the far reference point amounts to a maximum value of 18 millimeters, a main progressive length defined as the quotient of the addition and the maximum slope of the refractive power along the main line, wherein the main progressive length has a maximum value of 10 millimeters and an increase in refractive power, starting from the power of the eyeglass lens at the far reference point up to a point 2 millimeters below the centering point amounts to less than 10% of the addition and a progressive length corresponds essentially to the vertical distance between the far reference point and a point essentially on the main line at which, starting from the far reference point, the value of the power of the eyeglass lens corresponds the first time essentially to the near value, wherein the progressive length has a maximum value of 14 mm.