Abstract: A lathe for producing an aspherical surface on an optical lens blank has a horizontal base, and a spindle is arranged for disposition in a preselected adjusted position on the base to rotatably mount the optical lens blank about a first preselected axis. A support is arranged on the base for pivotal movement about a second preselected axis. The support includes a roller cam follower rotatable about a third preselected axis and having a cylindric cam follower surface, a cutting tool disposed in a preselected adjusted position on the support for forming the aspherical surface on the optical lens blank, and a fluid pressure motor conjointly urging the roller cam follower and the cutting tool in a direction generally perpendicular to the third preselected axis.