Optx 20/20 Stick-On Bifocals, +150

IMHO - The amount of light to the eye influences the power you will need, so get a higher power for sunglasses. These can be cut to any shape to reduce the height/width profile to limit field range affected by these lenses. I love my Mai Jim sunglasses and their ability to wrap around and shield the sun from both above the frame and sides, but was unable to read anything with them. I simply cut these lenses to the desired height/width and with a single drop of water apply them to my sun glasses and other eye wear. I wear my sun glasses during all activities, including swimming in both pool and ocean waters with significant time under the water, and so far the lenses have not washed off. However, you do need to rinse the lenses well for storage or you will get a white salt residue on them which reduces clarity. When I buy these lenses I get at least three different powers (e.g., 1.25, 1.50, 1.75) since the power needed will be influenced by the amount of light available to the eye (and sadly age/time - or as arms get shorter, hmmm maybe that is the problem). Therefore I'll add the 1.25 to the clear lenses I wear at work, and either 1.50 or 1.75 to the sunglasses depending on the light and activities. I'm fortunate I see things beyond the length of my arms, but need these lenses for close work, I can comfortably and quickly reuse these and stick them on any existing glasses (or goggles, safety glasses, scuba masks, etc.). I dislike having to carry any bags, purses, etc. which adapting any eye wear for all situations means I can enjoy my activities without having to carry or track multiple pairs of glasses or associated cases. To make life easier, if you think you'll need a particular power for more than one 'stick on' scenario, than buy that many; although they are easy to apply and remove back into the delivery case they came in, life is just easier (especially if you custom cut/trim them for an application) to just leave them on a particular item. Just a bit more information, when you can barely see that magnification circle area on glasses from the eye doctor, they are using the same stick on principal. I saw this when my husband went to the doctor to adjust his new glasses, they just peeled the circle off and 'stuck' a different mag lense on the glass, naturally I'm sure they used something other than a drop of water, but same principal. I tried getting glasses from 'eye glass places' several times but would significantly loose field of vision and felt I went from normal to legally blind - having the ability to trim and shape these lenses allows me to customize applications so I'm not looking through 'power' while walking or driving, etc. If you are really careful while trimming, you can get more than one application from a single set. For me, I only needed a very thin slice at very bottom of sunglasses so that it was not in vision field during normal activities and only enough there to intentionally view from bottom edge.

I had heard about these but couldn't find any locally. They go on very easily and are easy to remove or re-position with just a few drops of water. I don't need reading lenses regularly, but when I am wearing my distance lenses I lose some of my close up detail so these have been great. I put them on an old pair of glasses for when I am working with miniatures and want to watch a movie on the TV, or on my safety glasses when I am working in the garage and wearing my contacts. I do have other safety glasses that have magnifying areas built into the lenses, but these give a much larger field of view. So nice to be able to transform anything into readers/bifocals.

If the curvature of the glass lens does not match the stick-on bifocal, it will not sit flat and there will be a noticeable focal change making them useless.

I purchased 3 pairs of these stick on lens based on the reviews I read on line. It appeared from the reviews that I may need to replace the lenses for a couple reasons, falling off resulting in losing one side or the other and applying to a second or third pair of sunglasses. I followed the instructions carefully to apply the lenses to my sun glasses. These lenses are too thick to bend to the shape of my sunglasses and will not stay in place. They are terrible and I plan to return them. Not use able at all. I also purchased a pair of DeWalt bifocal safety sunglasses for 10 bucks that are absolutely amazing! Not very stylish but they are great for fly fishing or working with tools. I then purchased a pair of expensive bi-focal sunglasses, $200.00. The lens is practically invisible, they are also polarized. They do the trick but the bifocal lens is not placed as well as the DeWalt $10.00 pair.

Work exactly as advertised. Easy to install. Can now read GPS while riding and instruments aren't fuzzy.