Glossary of Optical Terminology - FEA Ind
Glossary of Optical Terminology Blocking, off-center The practice of placing the surfacing lens block at the desired location for the major reference point of the lens. Off-center blocking does not grind prism for decentration. Blocking, on-center The practice of placing the surfacing block at the blank geometric center of the lens and moving the major reference point of the lens to its ...