On 12/11/2023 at 12:24 AM, bvanant said:

I think you might be underestimating the need for good distance vision. I have a need for both distance and close correction and have a mask from Prescription Dive Masks in San Diego, works like a charm.

BVA

I've also had bifocals made from the same shop.
They are so good and useful (and expensive) that when I cracked the frame of my mask (due to stupidly placing the mask on my head and having it slide off onto a concrete pad) I sought out the same mask to move the prescription front glass intact from old to new mask.

"I have a friend who had tri-focals done a while back, I believe he had them changed to mono-focals, apparently a common side effect is visual disturbances at night, some people get used to them and some don't.  There is also an enhanced depth of field option which keeps a wider range in focus. "

I am quite skeptical of this. IOLs can be removed and replaced, but this is both tricky and quite rare. My opthalmologist says that while he does 600 to 700 implants a year he does one replacement every 7-8 years and then only if the original IOL has moved.

I just had both eyes done, great distance vision, sucky reading. One interesting observation, I had bad astigmatism and I still have some but it has rotated 90 degrees.

Cheers

Bill