A teacher demonstrated the effects of bifocal lenses on light. Video shows the lecturer passing laser light beams through eyeglasses at a school in Fushun City in Liaoning, China, on September 2 ...

Bye-bye bifocals. A new pair of smart glasses from the University of Utah may have just eliminated the need for spectacles.

The glasses' liquid lenses change shape according to the distance of objects, making reading glasses and bifocals unnecessary ...