Bifocals and Multifocals
When the doctor told you that you needed bifocals, you may have protested (verbally or only mentally) that you weren’t that old. Actually, you probably weren’t, even though a few grey hairs may have started to show up here and there. The average person begins to need bifocals in their 40s, and then only if he or she does reading or close work. Five hundred years ago when most people where illiterate and/or occupied with farming, bifocals were not necessary. (The life span was much shorter, too.) Today, they are almost indispensable. Read the rest of this entry »