This year, Essilor has introduced its eighth-generation progressive lens design, the Varilux X-Series. Based upon the highly successful S-Series, the X-Series has paid special attention to the ...

In 1972, Essilor introduced its second generation progressive design, the Varilux 2 lens. 1 Like the original Varilux design ... Table 2: Results of functions for near additions The (x, y) ...