Penn scientist: Instead of bifocals, some try monovision. But depth perception can suffer

Penn scientist: Instead of bifocals, some try monovision. But depth perception can suffer

While bifocal eyeglasses allow near and far vision in both eyes, some people opt to split the difference - correcting one eye with a contact lens to sharpen the focus on far-away objects, the other eye with a lens to see things close up.

Called monovision, this way of seeing the world is not for everyone, in part because it can interfere with depth perception.

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