{HEAD ~ A fourth optical surface} 16120 may be disposed in {TAIL ~ communication} with third support member 16110 
{ HEAD ~ A fourth optical surface } 16120 may be disposed in { TAIL ~ communication } with third support member 16110
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH