Bifocals (Old.) Frank C. Müller From Popular Science:
Near-sighted? Far-sighted? Middle-sighted? It doesn't matter--this "scratched" lens has you covered.
An inability to see both near and faraway objects isn't uncommon, but the classic solution--bifocals--is hardly cutting-edge. I mean, thanks, Ben Franklin, but how about something more modern? A new type of engraved lens, invented by an Israeli researcher, allows the eye to see perfectly whether the object is nearby or in the distance, without adjusting perspective. No matter your vision, these lenses claim to provide perfect clarity.
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