The aspheric surface of revolution is of a design to reduce natural aberrations inherent in imaging using surface of {HEAD ~ revolutions} of {TAIL ~ the conic family} of curves 
of
The aspheric surface of revolution is of a design to reduce natural aberrations inherent in imaging using surface of { HEAD ~ revolutions } of { TAIL ~ the conic family } of curves
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH