Hydrotac Stick On BiFocal Reading Lenses Mens Womens Clear Magnifying Bi-Focal Reusable Reader Adhesive Stickers

They work pretty good, probably should be considered a consumable and replaced periodically.

I've used these and similar stick on bifocal lenses for years, ever since I first started to need reading lenses. I live in Hawaii and am a runner, and you'd be surprised how often visitors to Hawaii stop me and ask for direction while I'm running, often with a map in their hands. With these lenses on my sunglasses I can read even the tiny print on those maps and usually help them out. I literally use them every day, and not just when I'm running, but anytime I'm outdoors. They adhere with a drop of water, and stay put even when washing the glasses with soap and water. If you ever replace the sunglasses or something happens to them (other than losing them) you can easily remove the bifocal lenses with a fingernail and use them again on the next pair. I will say that once they are in place on the sunglasses for a while they will leave an outline after you remove them, so I don't recommend moving them from one pair to another frivolously. All in all a great solution for a common problem. I strongly recommend them.

WARNING: CANNOT BE RETURNED. Perhaps it was just my seller,but I tried to return these and they refused. Nowhere in the product description do I see mention of these not being returnable. First time this has ever happened to me on Amazon. Review: I just got mine and, as I feared, I cannot aim my eyes through them to see the computer -- have to tilt head back so far its not practical. The only thing I have found them to be good for is to be able to look at my iPhone while I am watching TV, which is something I do frequently. Also, I have had some problem with their sticking to the lenses securely. I followed the instructions on a youtube video and got them to stick, but the slightest tap and they will pop off. For years, I have considered getting bifocals, but I figured they would not work for me the way I need them to, and this purchase has convinced me I was right. Tilting my head back just doesn't fly for the computer. So in a sense, these saved me a bunch of money buying real bifocals I simply cannot use. I purchased some clip-on "magnifiers" which work quite well for my common scenarios. They also have their drawbacks, but on balance, they work for me much better than bifocals will.

It takes awhile to get the hang of how to cut and set the lens so that it does not dry with air bubbles. Tip one is use lots of water and don't press it out too hard or too fast. Let the lens get tacky and then gently put it into its final position. Then gently press the excess water out and slide the lens to make small adjustments. Tip two is make sure to measure your center to center distance using an existing pair of bifocals - and use that as a guide for positioning the lens on your target glasses. This is not a replacement for sunglasses or cycling glasses with a bifocal option, i.e., Maui Jim makes awesome bifocal reader sunglasses. A built in bifocal is far superior to stick on lenses. However for one piece lenses like the Smith Pivlock or the Tofosi Podium these readers are fantastic.If you have sunglasses or sports equipment where there is no bifocal reader option then I highly recommend these lenses. Just remember to get at least 2 pairs so that you can practice on one set of glasses before working on the pair you really care about. Why can't they come out with a peel off sticky lens? I have no idea. However with patience and practice these are a life saver so that you can see your cycling computer or GPS.

I purchased these stick-on lens enhancements to prepare myself for glasses. I have used contact lenses for about thirty years, now, and I was beginning to have problems with irritations inside my right eyelid. I wanted to see how certain types of lens layouts would work with my daily routine, so I purchased these lenses to stick onto my "drugstore magnifying glasses". I have to say, they work pretty well... but I'm still not happy with wearing glasses. They tend to pick up a lot of reflections and in bright sun, it's even more difficult to see than with the contacts. For working on the internals of my computers, which I do fairly often. I find it daunting to get the reading magnification I need in the exact spot I need it, at times. I think the term used is tri-focals for how I arranged the lens enhancements. I cut the lenses in half, horizontally, and placed them high and low on the magnifying glasses I wear, leaving the horizontal center slot open for distance viewing. This keeps me from having to crane my arthritic neck up and down to read a computer monitor or work on things at different elevations. I have dislodged one of the "lens stickers" while cleaning, but it was pretty easy to reattach. I see others having problems keeping them adhered to their glasses, but I have had no problems with that, other than that one cleaning incident. I just use warm water and clean hands to affix the lenses on the back side of my +2.00 magnifying glasses, which I need to see distant objects... and with the 3.00 enhancement applied, I get the +5.00 reading magnification I need to read and do detailed close-up work. It's not perfect, but if I am never able to use contacts again, I have done my homework in getting used to wearing glasses, when the time comes. At least I can function, without having to wear two pair of glasses at the same time, so I can read... then remove one pair to see distant object. Carrying a pair of glasses in my pocket is not good for the longevity of the "pocket pair".

I’m a repeat customer. Several times over. They’re perfect for my inexpensive sunglasses (for biking and paddling). I highly recommend these.

Great if you need a bifocal lens on a pair of non-prescritipiton sun glasses.

These are good quality and can see to read well but they are pretty rigid so if your glasses are curved they don’t adhere to the glasses very well. The flexible ones do better

When it sticks it very good but I find it don’t stay on my glasses very long

The size of the lenses has been drastically reduced. Why. I liked them when they were the original size, slightly bigger. They are too small now

Muy util para poder leer con lentes obscuros

Exactement ce que je cherchais pour mettre dans mon masque de plongée. Solution simple et peu onéreuse et efficace. Collée avec de la glue spéciale verre, ça fait le taf !

Wie beschrieben mit einem Tropfen, meint ganz wenig Wasser aufgebracht und fest angedrückt (!) halten die Linsen in der Taucherbrille super. Dies gilt auch wenn die Brille permanent naß ist und auch nach mehreren Tauchgängen. Jetzt kommt der Wermutstropfen. Da die Linsen aus Kunststoff und damit hydrophob (wasserabweisend) sind, neigen sie in der Taucherbrille zum Beschlagen. Trotz den guten optischen Qualität habe ich sie deswegen wieder entfernt. :-((