Need suggestion of buying frameless eyeglasses

[bifocal glasses]

Comfort, fit and durability, which one do you prefer when choosing men’s eyeglasses frame? May be you want all the three features, that’s true, I keep the same opinion as you! But it is really a tough task, I am going to buy a new pair of frameless eyeglasses for office using, as my eyes often get red and fatigue after long time staring at the screen, but the problem is the nuts of such lenses can get loosen easily and the lenses may be bent up easily by some pressure, so, what kind of lens material is the best choice for rimless eyeglasses?