{HEAD ~ Methods} and {TAIL ~ apparatus} for designing reflective optical surfaces, including FS/UWA/RO surfaces, for use in head mounted displays are also disclosed 
{ HEAD ~ Methods } and { TAIL ~ apparatus } for designing reflective optical surfaces , including FS / UWA / RO surfaces , for use in head mounted displays are also disclosed
HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH