my prescription is for bifocal or progressive, and i want to a 30% grey tint with rimless frame. Concerning that the rimless frame is far more fragile than full rim or half rim glasses, most company would suggest you to choose a half rim or full rim frame instead of the rimless frame to effectively avoid the lenses get crack in the future use.

Also, 1.61 progressive/bifocal tinted lenses can solve this issue. But the cost is not too cheap.

of course, the semi rimless or full rim glass frames are stronger and more durable. If i were, i would select a half rimless one.