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