Abstract: A method of blocking a lens member having a surface to be manufactured on a lens holding unit, the method comprising: a lens member providing step during which a lens member comprising engraved markings is provided, a contrast providing step during which contrast elements are placed on the engraved markings, a taping step during which the marked surface of the lens member is taped with an adhesive tape over the contrast elements, and a blocking step during which the lens member is blocked on a lens holding unit via the taped surface.

Abstract: A machining method for machining a surface of a spectacle lens at a fixed rotation speed, includes a step of determining the rotation speed from geometric characteristics of the surface, characterized in that the step of determining the rotation speed includes the following steps: a value (Maxdiff) representative of the largest difference in geometric value of the mean sphere on the surface is determined; and the rotation speed is deduced from the value (Maxdiff) of the largest difference in geometric values of the mean sphere on the surface and from a geometric value of the cylinder (FV torus) at a predetermined far-vision control point.