Yet another known method uses a thermal gradient to ensure {HEAD ~ selective adherence} of {TAIL ~ the lens} in the mold 
of
Yet another known method uses a thermal gradient to ensure { HEAD ~ selective adherence } of { TAIL ~ the lens } in the mold
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH