Scratched glasses give perfect vision for any eyesight

 作者:屈突岔麓     |      日期:2017-11-03 04:01:00
By Jeff Hecht DITCH those bifocals. You might soon wearing spectacles whose lenses allow you to see clearly regardless of how long or short-sighted you are. With age, the lenses in our eyes often lose the ability to change shape enough to focus light from near objects onto the retina – a condition called presbyopia. This leaves people who were already short-sighted unable to focus on either near or distant objects. Bifocals offer a solution by having two lenses in the same frame,