Method for drilling an ophthalmic lens in a helical trajectory and associated drilling device

A method for drilling an ophthalmic lens, comprising the following steps of:

• storing the desired shape and dimensions of a drill hole in the ophthalmic lens and the position at which this drill hole opens onto one of the faces of the ophthalmic lens,
• positioning a drilling tool opposite the stored position of the hole to be drilled,
• determining a control setpoint for the transverse movement and the axial feed of the drilling tool, and
• drilling the ophthalmic lens in accordance with said control setpoint,
• wherein the control setpoint for the transverse movement and the axial feed of the drilling tool causes the tip of this drilling tool, during at least one drilling pass, to follow a helical or pseudo-helical trajectory depending on the desired shape and dimensions of the drill hole, and
• wherein the axial feed of the drilling tool during said drilling pass varies so that it is slower close to each face of the ophthalmic lens than in a central part of the thickness of the ophthalmic lens.