Making adjustable focus eyeglasses
AUG 17, 2009
DOI: 10.1063/PT.5.023602
NYTimes.com : Applied physicist Stephen Kurtin has spent almost 20 years of his career on a quest to create a better pair of spectacles for people who suffer from presbyopia—the condition that affects almost everyone over the age of 40 as they progressively lose the ability to focus on close objects.After many false turns and dead ends, he has succeeded in creating glasses with a mechanically adjustable focus.The glasses have a tiny adjustable slider on the bridge of the frame that makes it possible to focus alternately on the page of a book, a computer screen or a mountain range in the distance.He says they are better than other glasses and some forms of Lasik surgery.
© 2009 American Institute of Physics
