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

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I've been using these for several months now and they work awesomely. I'm not sure why some people have problems getting them to stick because I have two pairs of sunglasses, use them on both, and they stick totally fine on both pairs. I just made sure my glasses lenses were wiped clean beforehand and that I only handled the stick on lenses by the edges so as not to get finger prints on them. After placing them on my glasses, I used a clean thin towel to push them on tightly and work all the air bubbles and excess water out. They have stayed on my sunglasses through below freezing temps at home in Edmonton and tropical heat in Maui. The only issue I've had with mine was when I put a pair into my snorkeling mask in Maui. They stuck fine during my swim but I had poured some anti-fog liquid into my mask and didn't realize that it loosened up the seal causing them to wash away when I rinsed out my mask. So, if you want to use them for a diving/snorkeling mask, they will work fine, just be very careful when rinsing out your mask especially if you use anti-fogging liquid like I did. As for using the product itself, I use them exclusively in my sunglasses (except for the previously mentioned diving mask incident) and I love them. It's great being able to read things without having to switch back and forth between my sunglasses and reading glasses all the time. During our recent trip to Maui it was especially helpful to not have to continually carry reading glasses with me to the beach or wherever we went as I could use my sunglasses to read things like menus and price tags. I also enjoy biking and inline skating in summer and it's so much nicer to be able to check my phone (text messages, fitness tracker, etc) on the go without having to switch over to my reading glasses. After I got these I even noticed that the gauges in my car and my GPS display are quite a bit clearer now. If you've never worn bifocals, it'll take a little bit to get used to wearing them but once you adjust, you'll wonder how you ever managed without them.

Facile à installer sur des lunettes de soleil ou sur écran de vision de mon casque vélo. Très efficace, vision parfaite pour la lecture.

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!