I have 3 pairs of spectacles now. One for reading (also used at an upright piano), one for the grand piano, and one for distance. Bi-focals wouldn't be any good, because you want the keyboard clear too ( at the grand). To keep the cost down, I recycle my frames. And as the eyes are changing quite a lot at this age, I always go for the cheapest lenses, so I can replace them more often. it is no fun really, but you have to put up with it.