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