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