In a second embodiment of the invention, one optical element consists of {TAIL ~ two separate curves}, one aspheric curve on the concave side of the optic, and one curve of {HEAD ~ the standard conic curve family} on the convex side of the optic 
In a second embodiment of the invention , one optical element consists of { TAIL ~ two separate curves } , one aspheric curve on the concave side of the optic , and one curve of { HEAD ~ the standard conic curve family } on the convex side of the optic
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH