When Ben Franklin invented the bifocal lens, the two activities he wanted to switch between seamlessly without having to change glasses were reading and conversing with people. While bifocal reading glasses still fulfill this function, they have become so much more.
Today almost everyone uses a computer extensively. This means almost everyone stresses a relatively new type and distance of vision: computer vision. Bifocal reading glasses are now often designed and prescribed to assist you in switching between conversing with others and using a computer monitor. Sometimes these are just referred to as computer glasses.
In fact, you can even get trifocal lenses which enable you to switch among the activities of reading, using a computer and conversing with others or just being out and about. And with modern lens materials, these lenses don’t have to be big and ugly. You can find them in sleek and versatile styles. You can even use rimless designs.
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