a chucking method and apparatus for processing a lens blank in a manner requiring only a single mounting of the blank to an associated lens block . the lens block is mounted to the convex lens blank surface by a hot melt type of adhesive so as to extend outwardly thereof substantially coaxial with the lens blank frame center axis . the lens blank and lens block are releasably mounted in a chuck assembly associated with lens surface generating apparatus such that a desired optical center axis in the lens blank and the tailstock of the generating apparatus are coaxial . the chuck includes means for selectively rotating and / or canting the lens blank relative to the tailstock to accommodate desired axis and prism settings as prescribed for the finished lens . following generation of the desired optical characteristics in the lens blank , additional operations are performed thereon for producing a finished optical lens while the lens block remains affixed thereto . after these additional operations are completed , the lens block is removed from mounted association with the finished optical lens .