OPTX 20/20 unisex-adult Hydrotac Stick-on Bifocal

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 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.

I'm currently 52 and simply can't focus on things close to my nose anymore. With the way water plays tricks with light, the issue gets worse underwater. I like to do underwater photography and video, but I wanted to be able to get a closer view of my camera LCD screen, so (despite some reviewers saying they didn't have luck with these stick-on lenses) I decided to give them a try for 15 bucks. Here's what I would tell people to do for better success: 1. Despite what's been said, these absolutely will remain stuck, if you do what others have recommended which is to apply them with water and LET THEM DRY WITHOUT MOVING THEM FOR 24 HOURS. You only need a drop of water but make sure that any bubbles are worked out from under the lens, and let any excess water remain & evaporate which may get pushed out from underneath after setting them in place. If applying to a prescription mask which may have a curved surface, I won't predict how well they will stick. But when applied to my atomic aquatics venom frameless and following the instructions, they've stayed stuck now for 8 dives despite multiple applications of defog & mask scrub/cleaner. (I placed mine very low in the mask with the straight edge of the lens lined up against the vee of the mask nose section, so they look kind of like mouse ears. This has worked excellent for bifocal use, and does not obstruct my underwater view objectionably.) I do not let my mask sit in fresh water tubs on boats, but as an initial test, after they'd first adhered but before diving with them, I put some tap water in the mask and soaked overnight. They remained stuck. It's worth mentioning I cleaned the mask surface extremely well before applying them. 2. They do indeed seem to fog up more easily than the mask glass, but when I properly applied sea drops defog they stayed clear on *most* dives. When I additionally scrubbed them using mask cleaner (or soft scrub) before applying defog, they seemed to fog even less. Using both products on every dive will be my protocol going forward. 3. I bought the 1.5x version and I can focus on most anything right next to my face. Hope this helps --

I'm giving this product 4 stars not because it doesn't work, but because of limited usefulness. It's a great idea that is fiddly to apply. If you use them as is, you may have a better experience, but let me explain why they're fiddly. First, when you stick them onto your glasses, they take about 1/3+ of the vertical glass space, so they are a little large for my use, which was sunglasses. If you need them for working at a bench where you're mainly looking thorough them, they could be fine. However, if that's the case, why not just wear a regular pair of reading glasses? Second, when you stick them on, you get finger prints on them, and your glasses most likely. Once they are on, though, you can clean your glasses and them w/o them slipping off too easily. Third, you really do need to run them under hot water before you apply them. They're really stuff, which is probably why they are fairly distortion free also. They're not cheapo stick-ons either. They seem high quality and they come with their own case too.

I ordered 3 sets of +175. I have opened and installed 2 of the 3. Installation was quick and easy, but here are 3 pieces of advice: 1) Don’t ignore the instructions that tell you to make sure your lenses are clean, free of dust and oil. 2) Plan out your placment before starting. You only have about 5 seconds before the bond becomes too strong to adjust position. 3) Be prepared to hold them pressed tightly in place for a minute or more. Thety are significantly curved and very stiff. If you let go of them before they’re fully bonded, they will pull away from the glass, creating air pockets that make them useless. The first set I applied came out great, and work well for reading. The second set had a couple of problems. One lens had a manufacturing defect - a dimple at the right edge that I could feel with my finger. I installed it anyway, just to see if I could make it work. It couldn’t, and as expected, it has an air bubble under the dimple. The other lens in that set was so stiff and curved, the entire right side of the lens failed to bond no matter how long I held it in place, so it’s unusable. I still have the third set, and will try to remove the damaged ones and replace them, in hopes the second set was a fluke.

My co-worker told me about this product and I ordered it right away. I wear contacts for distance,and I was so tired of switching my sun glasses for my reading glasses. Now that I have put these on my sunglasses, I don't have that problem anymore. I was impressed by the quality. It's much thicker than I imagined. It was really easy to put on. Simply put a drop of water and it sticks. If you need to move it or re-position it, you can easily do that as well. It's a bit big for me, so ideally I would need to trim it to size. However, it doesn't bother me much, so I've left it. UPDATE: Today I wore my sunglasses with the stick-on bifocals and I LOVE IT!! I can see the dash when driving so much clearer and I can text on my phone and actually read what I'm texting instead of just 'blind texting.' I'm recommending this product to all my friends!

DO NOT PURCHASE! The brand MZWOTO is much better! My fault for not reading that the item is not returnable. One of the "stick on" lenses keeps falling off, despite following the instructions. Don't be fooled by marketing and packaging.

I have, or have bought, about 8 sets of these over the years that I use for non-prescription sunglasses in my car and on sunglasses I use for cycling. I have been using these for at least 5 years. I have sets that have been on glasses, in the sun, for at least 3 years and they have never fallen off or otherwise become unusable. I replace them only because when I (rarely) take them off the glasses to clean the glasses (after thousands of miles cycling road grime) I notice that they yellow over time in the sun. Like ski goggles, I don't ever notice the yellow tint, but every now and again I like to start fresh. I always have at least one spare set of new inserts in case I destroy a set of glasses or buy an additional pair. I keep these in my Amazon cart and usually pick up a pair when there is a temporary price drop. I only wear reading glasses, but at the 2 to 2.5+ level, and can't read my car gauges or my cycling computer without readers or these inserts. These work very well for me for driving and cycling. Hopefully, my eyes will stay about the same for the foreseeable future, and if they do, I will continue to apply these to all my sunglasses. If they don't? Well, I'll cross that bridge when it happens.