WHAT ARE BIFOCALS AND HOW WORK THEY
OK...you're over 40 and you can't read anything up close. Perhaps you should remove your spectacles so that you can read. Maybe you need those $3.00 pharmacy glasses, even if you wear them over your contact lenses. But you're becoming irritated because of all the on-and-off with the glasses. What should I do? It's time to discuss bifocals. Bifocal glasses have a correction for distant vision on the top of the lens and a correction for reading on the bottom. Benjamin Franklin actually invented the first bifocal. Yes, the same person who used a kite and a key to discover electricity! Ol' Ben simply cemented the top half of one lens to the bottom half of another, resulting in what is now known as an "Executive" bifocal. This basic lens has evolved into more advanced bifocal lenses. The flat-top bifocal is the most direct successor of the Franklin lens. These lenses include a big distance viewing region with a little insert or segment that helps you to focus ...