3 ms·
If you can afford them, freeform progressives will provide the largest usable field of view. Google “freeform progressive” for more. Note that “freeform” encap
by troydavis 5y ago
If you can afford them, freeform progressives will provide the largest usable field of view. Google “freeform progressive” for more.
Note that “freeform” encapsulates multiple types, depending on how much of the lens surface is custom: https://www.2020mag.com/ce/the-optics-of-free-form https://www.2020mag.com/ce/the-optics-of-free-form. Ask your optician how much you’d benefit from each and the price difference.
An optician that does this a lot will have a machine to measure your frame-specific pantoscopic tilt and vertex distance, not just PD.