Methods and devices to control polymerization

Abstract

A method and mold assembly to control the polymerization of a molded article. In one embodiment, an amorphous posterior mold comprising a non-critical surface having a controlled radius of curvature is used to produce molded articles. In an alternate embodiment, ophthalmic lenses are produced using a posterior mold in which the concave surface of the non-critical surface is filled with a liquid having a similar refractive index as the mold material. In still another embodiment, a positive lens is placed at a predetermined distance adjacent to the mold assembly to alter the irradiation path to the mold assembly. In still another embodiment, a positive lens is placed within the concave surface of the posterior lens.

1 - 13 . (canceled)  
   
   
       14 . A mold assembly comprising first and second mold portions, said first mold portion having first and second opposing surfaces, said first surface comprised of a concave surface having a controlled radius of curvature and said second surface comprising an optical lens-forming surface, said second mold having first and second opposing surfaces, said first surface comprising an optical lens-forming surface, wherein said mold portions matingly engage to form a lens forming cavity therebetween said second surface of said first mold and said first surface of said second mold.  
   
   
       15 . The mold assembly of  claim 14 , wherein said first mold portion comprised of an amorphous material  
   
   
       16 . The mold assembly of  claim 14 , wherein said amorphous material is polyvinyl chloride.  
   
   
       17 - 31 . (canceled)