Abstract: A lens block for use in securing an optical lens during cutting, grinding and polishing of the lens is disclosed wherein the lens block is formed from a plastic material and includes various radially extending grooves for introducing an adhesive material between the lens block and a lens blank to be worked upon. The grooves also defined therebetween various ribs and upstanding surface portions which function to increase the surface area of the lens block for adhesion purposes and to provide additional structural rigidity to the lens block which prevents flexing of the block.