I'm nearsighted, and I use reading glasses at my age, but when I was younger and used the same glasses everywhere, occasionally my left eye would just give up focusing and I'd have blurry vision for an hour or two. It'd be pretty disruptive to my work and I'd have to take a break. It'd occur a few times a year.
These days I still use screens a lot but I don't recall the last instance of this happening, and I think my reading glasses have largely solved this problem for me.