Electronic lenses. Yes.

Lenses that alternate between focal lengths automatically – that’s like Science Fiction 101…As the technology improves I think we’ll see glasses that can hit several different focal lengths, maybe even in a continuum. That way, everyone could buy the same pair and just adjust them to fit your range of visio …Pixel Optics, sell your glasses quickly. There’s an aging populace out there that could end up buying millions of these things, but wait too long, and you’ll miss the window of opportunity.

via Electronic Glasses Let You Change Focus In a Split Second. Goodbye Bifocals! (video) | Singularity Hub.