What is “jump image”? When a bifocal or trifocal wearer's line of sight moves across these lines, images suddenly move, or "jump." Progressive lenses provide a more natural depth of focus than bifocals and trifocals. Because of the advantages progressive eyeglasses become more and more popular among people over age 40. Today’s progressive eyeglasses become more comfortable to wear and more easy to adjust to them.

One of my friends who also more than 50 years old and has prescribed a pair of progressive glasses. But he told me that when it comes to progressive glasses, I have to go to a professional optical store for buying. Because of the high technology is needed. But I don't want to pay too much on it. Where can I get such kind of glasses?