Not Your Father's Bifocals
Future glasses could use liquid crystals to switch from close- to long-range viewing at the touch of a button.
Jul 1, 2006 5:00 AMNov 12, 2019 4:54 AM
Next-generation bifocals get rid of double lenses. Instead, they use tiny electric voltages and a layer of liquid crystals. | Courtesy of Lori Stiles, University of Arizona
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