Thank you for a detailed answer. It's a bit of an overkill for me, and you've mixed up my eyes. I have +1.75 in OD, which is Right.
Let me put it simply: I bought a +3.00 cheap reading glasses and brought them home. When I put on my mask and look through its plain lenses AND the +3.00 reading glasses placed on top of mask lens (touching it), my vision is perfect! I can read my wrist computer/watch at close range better than with my prescription glasses.
My reasoning is. If instead of my "experimental lens" I will have bifocal Mares lens - I will see my gauges perfectly. Right now,
LeasurePro has Mares Bi-Focal Corrective Lens for X-Vision/Liquid-Skin Mask for a very reasonable price.
Also, it's important that I never use any glasses except when I read or work on computer. I drive, walk and live all day long without glasses, and I don't feel any need for them because my distance vision is nearly perfect (95%).
Since you are so specific about all the optical info, my full prescription is:
OD SPH +1.75; CYL -1.00; AXIS 075; ADD +2.50
OS SPH +0.75; CYL -0.25; AXIS 037; ADD +2.50
---------- Post added August 2nd, 2014 at 05:15 PM ----------
I am ONLY interested in optical magnification in the bottom part of my mask lenses - to read the numbers for safety and to select settings for photography. I can see the underwater world in the distance PERFECTLY without any correction lenses.
Water magnification in my opinion and from what I saw does little to improve clarity. All I could see was a larger image of my blurry Suunto Vyper's screen.