This loss of flexibility typically leads to difficulty with reading, he explains, and many people will notice that while they’ve never needed glasses ... Bifocal from Readers.com has a round ...

Here’s a pair of glasses from PixelOptics that replace bifocals, changing from distant vision to close-up with the flick of a switch. Sure, this prototype is rather odd-looking, but its ...

Progressive lenses are an update on bifocal and trifocal lenses. Both of these more traditional types of glasses have telltale lines in the lenses. Progressives have a seamless look. Sometimes ...

Bifocal, trifocal or varifocal lenses already allow the wearer to use one pair of glasses to see at different distances but they are not suitable for everyone. BBC Click’s Emily Bates reports.