I spoke to Arlene (Varilux rep) yesterday and she told me about the Varilux Sport lens that's coming out soon. I asked her if this was going to be a free-form design lens. She told me the entire lens design is digitally ground onto the the back surface of the lens. The front base will be a simple aspheric curve and all the curves will be on the back, yes even the add.
Pardon me if this is old news, but I am shocked by this.
Won't this lead to higher order aberrations or will free-form design eliminate this? And have other lens manufacturers used this method aready?
This is obviously a cheaper way to make PALs since the lab only has to carry semi-finished blanks in a particular base curve not the base/add spectrum of inventory.




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