After several purchases of different models, I realized the following simple thing: if you don't have a "narrow" head of 10 cm, so that the frame doesn't open at all, after some time, ALL of them break. Regardless of lens quality.

Indeed, it's not worth it... instead of wasting money, trying and hoping, you buy glasses from a store and everything is fine. When needed, you change the lens. Also, presbyopia is covered by insurance if you have the examination at a public hospital.

Bone frame and a bit delicate but the lenses are very good. They don't make you dizzy like glasses from bookstores, for example, but they are not meant to be worn constantly. In summary, a very good product for its price.