Bifocal contact lenses

Abstract

A device for manufacturing bifocal contact lenses is provided. It comprises a rotating head stock provided with an eccentric head supporting a lense holder for holding a lense blank. The lense holder is displaceable with respect to said eccentric head in a radial direction perpendicular to the axis of rotation. A sled is provided for supporting a cutting tool. Said sled pivotable around an axis which coincides with said axis of rotation and in addition displaceable to change the radii. For avoiding a step which would result at the junction line dividing the distant vision segment and the near vision segment, a control is provided for adjusting the tool to a first radius R1 for cutting the distant vision segment and for adjusting said tool to a second radius R2 for cutting said near vision segment. After cutting the distant vision segment during a first operation, the near vision segment is cut during a second operation such that a continuous transition is achieved between both segments.

Dependencies are inferred from the claim text.