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Bifocal Reading Glasses and Their Uses
Bifocals are not a new gift of science in recent times. It was first designed by Benjamin Franklin in order to eliminate the continuous adjustment of glasses to align his vision with changes in near and far objects. He designed a glass that allowed him to see distant objects as well as near objects. Benjamin Franklin did this by simply cutting two different pairs of prescription glasses in half and using half of each lens for each eye. Technology has advanced since then, but the basic way of doing it is still the same.
The bifocals that were made in earlier times had the concept that people generally look down when reading or look at something close, but look up when looking at distant objects; therefore the bottom half of the lens is usually designed for close vision. Later versions of bifocals had the lens cemented on top of each other; as today most bifocals are made by molding one reading lens to the other looking far from one. Bifocals have many different designs, generally vary in shape and size. There are also trifocals.
Most people choose bifocals for vision problems, which is often known as presbyopia – the inability of the eye to focus on objects at different distances. Presbyopia should not be confused with long-sightedness, although it is widely misunderstood as such. Each year, nearly 4 million Americans develop presbyopia, most often in middle age, sometime between the ages of thirty and fifty. If you are a diabetic then you surely have a double chance of getting the disability of presbyopia.
The first sign is the inability to focus your vision on something close, such as reading newspapers, books etc. Presbyopia very slowly corrodes the years falling in the old age of the patient, get well you need the medicine for almost two years. There is no way to stop it, although it has never been reported to cause total and permanent blindness.
Bifocals are good for you as long as you can have clear vision, that is, when you use the prescribed lens. First time users will face a problem when you start using it; but as the day goes by he will heal. It is also possible that things appear closer than they really are when you look at the lower part. The key is to use it and keep using it; the eye like various problems in our life has its own way to put it right.
Generally computer users and readers are greatly helped by the bifocals, as they are constantly changing their focus from one point to another. Some people complain of a ‘headache’ after using the bifocals, the headache or ‘tired eyes’ is just a scenario that you will face as a new user. You may have to keep it beyond natural. However, it is recommended that after you read through the bifocal lens you try to focus on something further away, this will be a good exercise for your eyes and will help you in a long-term process.
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