Originally Posted by
IC-UC
When I say conventional blanks, I mean the front is pre-moulded (whether digitally or not) and the digital design is then surfaced onto the back. In my time at the lab, we were just setting up the "freeform" generators, and at no time was front surface generating discussed.
So if they are using pre-moulded or conventional fronts, then they can not decenter the blanks which then makes it less a freeform than one which is done on a spherical front, IMHO.
I may be way off target here with my simplification of the process, but this is as far as i know about these lenses as each company (and optom) has their own opinion on what a freeform lenses is. I guess whoever spends the most on marketing will win that battle!
But i woul like to know if all Freefrom lenses should be able to be decentered, to a certain degree, and if not do we still call the freeform or just digitally surfaced lenses?