You can only buy correction lenses in integer strength, i.e. -2, -1, +2 and so on. But you can combine that with the built-in correction to get just anything you want.


I can use my glasses OK, together with some slight adjustment of the diopter in the camera. But when I add a correction lens, I can use the built-in adjustment in one direction when I wear my glasses and in the other when I take my glasses off. So I can get it good both ways.