In modern times, we have to work under great pressure that can cause great tension and fatigue to our eyes. And most of us have to suffer from various sorts of eye problems just for this reason. Wearing eyeglass is one of the best and safest ways to deal with such problems. However, we are always bothered by the question-how to select good and suitable eyeglass. Here is an introduction to eyeglass and you may get the information that you need before selecting it.
History
Over 7centuries have been past since the first eyeglass made its appearance. It gets changed very slowly in the early several centuries. But some achievements are gained in its model, its frame, and lenses. However, great changes have been taken place since the 20th century. For example, plastic, polymer, and many other intelligent materials can be used to make its frame, lenses. In particular, in the new century, the meaning of eyeglass is broadened.
Improvements
Judging from the standard before the 20th century, eyeglass is made of three parts, namely, the frame, the lens, and the nose pad. Nevertheless, in modern times, eyeglass may not have all those features, such as, rimless eyeglass.
The original function of eyeglass is vision correction. And this is also the great sales point for eyeglass. Many eye problems can be treated with eyeglass, including the commonest ones, as nearsightedness, farsightedness, etc. Special eyeglass is also designed to cope with some hard-to-cure eye problems. Bifocal and trifocal are very typical examples.
New features
Furthermore, good eyeglass has some very nice characteristics that can not be found in traditional ones. The first one is UV blocking. There are many harmful radiations and rays in the sun light and they can cause great damage to our eyes if our eyes are directly exposed to them. The UV blocking eyeglass can filter out all such rays. Another is anti-scratch. Lenses scratch easily and this will damage eyeglass. A special anti-scratch coating is imprinted on the lenses and they will not be easily scratched. Anti-explosion is another feature can be found in good eyeglass. In the past, breaking glass can lead to great injury to our eyes, for the glass breaks easily. Now anti-explosive eyeglass will not break into pieces though struck by strong external force.
Derivation
Sometimes, lens will be tinted for some particular purposes. Doing so has led to the emergence of sunglass. Sunglass is a special kind of eyeglass and it can also be used to rectify eye sight. Tinted eyeglass, sunglass, has gained great popularity just because of its colors.
Accessory
Some designers are struck by the inspiration that tinted eyeglass is very popular. And they instill some fashionable elements into eyeglass. Henceforth, eyeglass becomes one of the most important accessories for many people. They will have to consider what kind of coats and shoes to match with the glass and in which way they will be looked much nicer, etc. Or special eyeglass that can be fold up is usually used as hangs.
All above mentioned information can give you a clear idea of what eyeglass is and the features that good eyeglass possesses. If you want to select good eyeglass, more attention should be paid to the latter part of this article.
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