METHOD OF MANUFACTURING PLASTIC LENSES

摘要

The present invention provides a method of manufacturing plastic lenses of urethane type resin having no or very little optical strain by the casting polymerization method. In the casting polymerization process, polymerization is effected while a suitable motion, for example, a particular rotative motion, or a motion based on rotation with the rotatable shaft disposed horizontal is imparted to the shell to change the direction of the gravity acting on any minute portion of a monomer injected into the shell.