When the optical material is cured, {HEAD ~ the mold assembly} is opened to expose {TAIL ~ at least one flat curve} of the pre lens 
When the optical material is cured , { HEAD ~ the mold assembly } is opened to expose { TAIL ~ at least one flat curve } of the pre lens
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH