Freeform Progressive

[gene_bautz]

Is it correct that you measure the total near reading power of a freeform progressive lens processed with position of wear to decide if it is good for dispensing?

[drk]

I don't. I think it's OK to check the engravings. My auto-lensometer is less accurate than the degree of exactness that the lenses are made to.

[DanLiv]

I do the same as drk, there is a lot of trust in technology necessary with compensated freeform designs, and I trust the process. However, they should still read very close to the compensated power, just make sure you are comparing to the compensated total power, not the prescribed power.

[Elvis Is Alive]

Near Variable Focus (NVF) or "Computer PALS" are the only lenses that I am aware of that the manufacturers typically recommend to verify near power for accuracy.

[DanLiv]

Elvis you are correct, I misunderstood the OP's question. Freeform progressives should be verified at the distance power circle, as that is the primary power reference of the design. One ought to be able to get a reasonably accurate near power measurement as well, just as with traditional progressives, but that should not be used as the verification power.

[Alfredo Alaniz]

I believe verifying the total near reading power is important, but I wouldn't solely rely on it for dispensing. It’s crucial to check the distance power circle to ensure accuracy with freeform progressives.