Raise your hand if you like wearing bifocals! Trifocals? Help may be on the way . . .
Later this year, you may be hearing about “e-glasses,” which adapt to where you’re looking with the click of a button. One click, close reading; another click, distance; a third click, mid-distance. From CNET:
The lenses are made with a type of liquid crystal, sandwiched between traditional plastic lenses, that reacts according to the electrical charge passing through it. The frames run on rechargeable batteries. Pressing the button sends a low-wattage jolt through the liquid crystal, which expands or contracts to change the shape of the lenses, thereby changing the focal range.