OPTX 20/20 Hydrotac Lenses for Presbyopia/Additional Removable Lenses/Lenses For Sunglasses Cycling Fishing Diving Mask, Clear, +2.50

These are great. I use them inside my lamp working didymium glasses. It was painful to wear my sight glasses under the lamp working glasses, prescription didymiums are horribly expensive and so are the fit-over glasses, so I gave these a try. I have had no problems with them falling off, as other buyers have. For my personal use, they would have been nice slightly bigger, but they do the job very well. Very pleased with them for the price.

These looked just the job, as I need an extra +1 when reading with my ordinary general +2 glasses. I prepared my glasses by ultrasonic cleaner, the best cleaning method available, and followed the instructions to the letter for fitting them. The stick on bifocals, constantly fell off, no matter how much or little water I applied first. Eventually they fell off while wearing them and got lost. Very disappointing and a total waste of time and money. Hoped to get a refund/ return, but not available on this product.Had a refund been given, I would have given a better review, any product can be faulty, and it's how the seller deals with it that makes things right, or not ... But as I'm out of pocket and with no usable item, I'm here venting my displeasure.I'm convinced I followed the instructions completely and methodically, and there was no way these things would stay on. The fact that there is no return or refund makes me consider these to be the worst item I have purchased from Amazon since being a loyal customer sine 2008Make your own mind up, but be prepared for disappointment and no return if things go wrong

Worked well in my diving mask, albeit they could have been a little larger. Very easy to fit and a very good price compared to buying a prescription mask.

These readers work a treat on sunglasses and r difficult to see from the outside. Great for reading my phone messages and menus whilst out n about.

These lenses did not stick on my mask as securely as other makes of plastic lenses that I have used. They stayed in position better when I used them on a pair of sun glasses but even then air bubbles developed between the glass and the lenses although that did not seem to affect the way they magified what I was looking at.

I bought these to add to my Cressi Dive mask. I noted in the description that they could be trimmed to fit but was hoping I wouldn't need to. but they fitted perfectly.On land they work a treat, haven't tested underwater yet but I'm sure they will be fine. Simply to fit to the original lense and once allowed to dry fully they're attached firm.

I watched several you tube videos on how to use these as well as reading the instructions.I have tried them in 2 different types of glasses, with a plastic frame - which is easier, and with a wire frame which is tricky because there is nothing solid to line up against.The curve of the stick-on is different to the curve of my glasses and no matter how I try, it quickly peels away from the maximum convexity producing an air bubble. Even where it sticks to the glass the legibility of print is not good. For me, this has been a complete waste of time and money .

These worked well on two pairs of sun glasses whilst on a European cycling holiday. First on my regular Ray Bans and then easily removed and put onto my cycling glasses. They took a little getting used to whilst cycling but over all were very useful.