Donegan ELS 2 Watch And Clock Makers Single Eye Loupe, 5x Magnification

I've been using these little magnifiers for years. Here's a simple recommendation - Buy the DOUBLE magnifier style. Even if you only want to use one of the magnifiers. The SINGLE style is difficult to fit onto any of my glasses. Plastic frame, wire frame, safety glasses, reading glasses, any of them, the little clamp thing on the SINGLE magnifier doesn't allow the mag lens to "clear" the front of the glasses. But the double style, with one magnifier removed, fits and clears.So buy the DOUBLE, not the SINGLE, to get a better fit on your glasses.

Forget it, they don't work from the distance ( eyes-object) if you mount them in your glasses. They work if you hold them with your hand like any other loupe, but if you mount it in your glasses you will have to approach the the object almost over it. I don't recomend it.