Thank you all soooo much, so aspheric high index mainly for the thickness correct :-) ???!!!!
Something else now, according to FDA regulations all lenses must be made impact resistant by treating them in some manner that's correct, right ???
And which plastic lens demands an a specially high quality surface, is it a lens that will be ultraviolet dyed, tinted a solid color, anti reflaction coated or scratch coated ??? I tip on the scratch coated, am I right ???
Thanks for all the quick replies I really appreciate it !!!