can you say sth about the benifits of the back side add?
can you say sth about the benifits of the back side add?
Backside add can not be done because then you would have to surface the front side and todays optical machines are not equiped to surface front sides.
I think maybe seanl was referring to lenses produced by non-traditional means (whereby back-side adds certainly are possible).Originally Posted by Chris
Chris there are CNC machines out there capable of producing front or back side progressive additions. Just not using the "traditional" equipment.
J. R. Smith
All free form systems can do both sides.
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