Bifocals Reading
Bifocal reading glasses by MichellePerkin
When people are at their 40’s, they are highly possible to develop a blurry vision while reading books or looking far away. The medical term for this eye disorder is presbyopia, which is caused by the loss of eye elasticity and inability to focus sharply at people’s middle age. Researches show that there are 4 million of Americans develop presbyopia every year. Before people have to prepare two pairs of glasses, one for near vision, the other for far vision. But after a certain time of period, people were tired of putting on and taking off glasses frequently at their different needs. Now bifocal reading glasses can satisfy people’s very needs at this point.
Bifocal reading glasses are invented by Benjamin Franklin around 1760, who was also bothered by presbyopia and annoyed of removing and replacing glasses from reading to looking far away. One day, he came up with the idea to cut both lenses into half, and then put the distant vision lens on the top, and reading lens at the bottom, so that in this way, with one pair of glasses, people can not only able to look far away clearly, but also reading clearly. That’s the basic idea of bifocal reading glasses. Though bifocal reading glasses have come through several centuries of development, the basic principle is still the same one. Nowadays, bifocals are most commonly used for presbyopia, and there are a wide range of bifocal reading glasses available on the market with different designs, shapes and sizes.
If now you are bothered by presbyopia, and have interest in this kind of eyeglasses, before you decide to buy a pair, it is advised to visit your eye doctor to have your eyes tested firstly. Please bear in mind this is of great importance for your vision. Your eye doctor will give you some advice on the right prescription for your bifocal reading glasses. Therefore, you can rest assured to have the exact correction you need and enjoy the clear vision bifocal reading glasses bring to you.
About the Author
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This entry was posted on Sunday, January 15th, 2012 at 10:27 am and is filed under Eye Vision. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.