General resin lenses bụ thermal siri ike ihe, ya bụ, akụrụngwa bụ mmiri mmiri, na siri ike anya m na-etolite mgbe kpochara. Igwe anya anya PC, nke a makwaara dị ka “anya m oghere”, “anya anya igwe ụwa”, nke a na-akpọ polycarbonate nke kemịkalụ, bụ ihe na-ekpo ọkụ.