What Are Spectacle Lenses?

You see other people wear glasses by the road side

. When you see people wearing glasses, the first thing that comes into your mind is poor vision or something that relates to people having difficulty seeing things. One thing that got you curious is how these people ever got to see clearly with their glasses.

The glasses these people wear are no ordinary glass you see everyday in malls or on your table. They are special glasses called Spectacle Lens or brilleglas that helps correct their vision so that they will be able to clearly. They cannot wear this spectacle lenses if there is no frame supporting it.

People before even wearing glasses always go to a doctor and have their eyes checked to determine the condition of their eyes. The doctor then prescribes a pair of glasses for them basing on the test that was conducted with the patient. Most of the tests have something to do with letting the patient read a series of different sizes of letters. Most of it end with letting the patient test a series of spectacle lenses to check which lenses can they see better.

The form of the spectacle lens was not like it was before. The invention was discovered by ancient Egyptians through a hieroglyph indicating that no matter how small the letters are, the can be magnified and enlarge by seeing through a glass full of water. Emperor Nero used to watch gladiator games on the arena through the use of an emerald to use is a correction lens.

Corrective lenses were created, according to historical records, during the ninth century by Abbas Firnas. He made a way to make a faultless glass in which a person can see letters clearly.

Around the year 1284 in the country Italy, a person named Salvino D"Armate was given credit for making the first eyeglasses that is wearable since most of the glasses before this was invented are needed to be hold on to but not wearing them.

In the year 1604, Johannes Kepler made known to the public in his treatise about astronomy and optics where he explained why a person can see clearer on concave and convex lenses. These lenses can correct eye vision illnesses such as myopia and presbyopia.

Benjamin Franklin, in the year 1784 invented the bifocal lenses because he was suffering both presbyopia and myopia and was tired of switching two kinds of glasses.

In the year 1825, George Airy, a British astronomer invented the very first lenses that can correct astigmatism.

The invention of spectacle lenses or brilleglas began to evolve. There are even demands for eye surgery and contact lenses but the use of spectacle lenses still remained.

by: Petar Genchev

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