Hydrotac Stick-on Bifocal Lenses (OPTX 20/20)- +1.75 Diopter

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

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.

Ich benutze die "Linsen" mit +1,75 Korrektur in meiner Radbrille für das Fahren auf der Straße. Da man durch die Kopfhaltung eh eher "nach oben" sprich mit Kopf herunter gebeugt und Augen nach vorne schaut, brauche ich noch nicht einmal die Einlegelinsen kleiner trimmen, ich schaue meistens "oben drüber" weg. Und endlich kann ich wieder ohne Probleme meine Daten auf dem Computer sehen, wenn ich fahre!Der Übergang zwischen den beiden Zonen ist natürlich krass und man kann eigentlich immer diese Kante sozusagen in der Peripherie sehen, aber es ist ja auch keine Gleitsichtbrille. Aber selbst als Benutzer einer solchen Gleitsichtbrille im normalen Alltag fällt mir dieser Übergang bzw. die Anpassung meiner Augen daran bei meiner Radbrille sehr leicht.Für die einfachste Lösung, die Dinger richtig gut anzupassen verweise ich auf eine Rezension bei amazon.com, also in den USA: 1. Brille richtig gut sauber und trocken machen 2. Tasse mit heißem (fast kochendem) Wasser füllen 3. Mit Pinzette die Linse nehmen und in das heiße Wasser eintauchen, bis die Linse schön weich und biegbar ist 4. Einen kleinen Tropfen Wasser mit der Linse "mitnehmen" und auf die Brille tropfen 5. Einlegen und anpassen 6. Mit dem (sauberen) Finger kann man dann die Luftblasen, die noch unter der Linse gefangen sein sollten, leicht nach außen rausdrücken. 7. Trocknen lassen. Fertig.Ich halte dann beim Abwaschen der Brille nach dem Radfahren um den Schweiß abzuwaschen die Linse einfach mit einem Finger fest. Das ist schon alles.Um die Größe anzupassen, eignet sich laut eines anderen Nutzers in den USA eine richtig scharfe Schere. Ich denke mal eine qualitativ gute Nagelschere wird dabei gute Dienste leisten können. So würde ich sie beschneiden, wenn die Brillenform dann doch zu "flach" ist, dies Korrekturlinsen also zu weit ins normale Sichtfeld ragen. Mit ein bisschen Geduld dürfte das kein Problem sein. Muss ja nicht perfekt sein...Ich bin begeistert!

Great for using with good quality sunglasses. Attached using warm water and have had no problems.

I used these after cataract surgery when my new glasses were delayed at the optometrist, and I had to get through a long business trip in the meantime. I really only needed readers, but quickly got tired of taking them of/off. I purchased a very inexpensive pair of frames with "demo" lenses in them. These stuck to those just fine (because the lenses were quite flat), and I didn't have to reset them once. I also had several pairs of wrap-around sunglasses, and they did NOT work on those. So words of advice from my experience, since I orders 3 pair of these for regular glasses and sunglasses:---As others have said, if there is much curvature on your lenses, forget it. I could not get them to stick---If you cut them down, be careful. It's easy to cut them down too much! Once cut too small, well...---Cutting them with a sharp Exacto blade worked much better than scissors for me. But they slip when trying to cut on a mat, so I put them on a small piece of the close-weaved rubber shelf liner I had, and that kept them from slipping on the cutting mat.