When I am fishing from my boat I often wear sunglasses – well in the summer at least! Everytime I re-rig hooks or tie knots I have to take off the sunglasses and reach for reading glasses or bifocals. Last weekend I decided to try a set of Optx 20/20 stick on bifocal lenses. They are made from thin, optically correct plastic. I bought them at Walgreens for $9.99. They come in a plastic storage case.
To install them on a pair of sunglasses, you just put water on the lens of your glasses, and the Optx lenses stick on by hydrostatic bonding. Then dry the glasses off and they are ready to use. You can remove the lenses by getting the glasses wet and peeling them off, and they can be reused many times. I trimmed the lenses down some with a sharp pair of scissors. Here they are on my Serengiti Driver sunglasses.
From the front, you can barely even see the stick-on bifocals.
You can get them in powers of 1.25, 1.50, 1.75. 2.0, 2.50 and 3.0. I tried them out today and they work great. Prescription bifocal sunglasses would be nice, but I am pretty happy with these, especially for the price.