hello im looking to make finished or semi finished lenses in cr-39 i have two surfacing labs moving over 5 to 8 thousand pairs constantly a month just for sv, not including progrssive, ft,s..etc..etc i know i have to spend a lot of money doing this but i will like to know somothing of this kind of information...can anyone help me....(i dont know how to write english very well) thank you...i already contact a ppg supplier or consultant but no answer, so please anyone help me!!!