Bifocal glasses were first invented by Benjamin Franklin, one of the founders of the United States. He simply cut two pair of different prescription spectacles in half and combined them together for each eye. This is the fundamental principle of bifocal lenses, even though technological techniques have progressed significantly until now. With his creative design, Benjamin Franklin could see distance objects as clearly as the near ones.
A bifocal lens of Benjamin’s style has two different parts: the upper half for distance vision and the bottom half for near vision. This is the most natural design that people are accustomed to look up to see distant things and look downward to perceive close-up objects. There are other designs of bifocal lenses that have different shapes or sizes of each prescription parts. But this basic concept has never been changed.
Presbyopic folks can benefit most from bifocal glasses. This eye condition is different from farsightedness, which is a common misconception. An obvious sign of presbyopia is the inability to focus on near things such as newspapers, books and so forth. Presbyopia is very common among people in their middle ages. It is estimated that approximately 4 million Americans develop this eye problem every year. And diabetic patients have a double rate of getting presbyopia.
Presbyopia can not be stopped that it will slowly corrode the falling years of the patients. Although total or permanent blindness is rare, presbyopia can interfere in one’s daily life. In this case, vision correction is quite necessary for presbyopic patients. Bifocal glasses are the most appropriate solution.
Individuals who use bifocal glasses for the first time may need a period of adjustment. At the very beginning, the things through the lower part appear closer than they really are. In serious cases, some new users even report a headache or tired eyes. After several days, the eyes can adapt to different prescriptions in a lens and the vision correction at both distances will be comfortable.
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