Among the numerous options of eyeglasses, a customer may have difficulty in selecting a personal-suitable one. Both eyeglass lenses and frames have many types according to styles and materials. It is always necessary to differentiate metal frames from plastic frames, and compare glass lenses with plastic lenses. While eyeglass lenses are closely related with comfort vision, eyeglass frames are more closely associated with one’s appearance. Choosing an appropriate pair of eyeglass frame is essential to enhance the wearer’s natural beauty and express personality. There are some factors to be evaluated associated with a frame. Frame materials have been emphasized for many years. Nowadays, even metal frames made from titanium, stainless steel and memory metal can be lightweight and strong. These advancements have made frame materials less decisive in showing good look. However, there are some other factors that are determinative when customers try to choose individuals eyeglass frames. Simple questions such as who need round eyeglass frames and who need those rectangular ones are actually commonly considered by the public.
Frame shape is really one of the most important factors to be assessed. As a basic rule, the frame shape should contrast with the wearer’s face shape. With this criterion, it is easy to answer the discussed question in the last paragraph. There are generally two groups of individuals who should choose round eyeglass frames. The first group is people with a square face, which means they have a strong jaw line and a broad forehead, plus the width and length are in the same proportions. The other group contains individuals with an oblong face, which has a long straight cheek line and sometimes a longish nose. Both of these two groups have obvious facial lines or angles. According to the rule stated before, it is necessary to offset such obvious lines and angles. In this sense, round eyeglass frames or similar oval frames are the right choice. Based on the same rule, those individuals with oval or round faces should choose rectangular eyeglass frames.
In fact, frame shape is not the only factor associated with personal appearance. There are also decisive elements including frame size and frame color. Considering the first factor, the frame size should be in scale with the wearer’s face size. And the frame color should repeat the user’s natural coloring. Both of these additional factors are as equal important as frame shape. Round eyeglass frames should also be given a proper size and color.
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Eyeglasses, defined in Wikipedia, are frames bearing lenses worn in front of the eyes. They are formerly used for vision correction; later for eye protection, either from foreign matter or from harmful rays. In fact, they can be a major part of person image and expression as well.
Eyeglasses are thought to be one of the most important invention of mankind history, because without them, scientists may not be able to do precision researches and bring so many discoveries to us; without them, we ordinary people with eyesight problems will never observe the beautiful world around us clearly.
Since eyeglasses are so important to us, what do you know about them?
Eyeglasses emerge earlier than most of us imagine. The first recorded use of corrective lenses may have taken place around 1st Century AD in Rome, while the first pair of wearable eyeglasses was invented around 1284 in Italy by Salvino D’Armate. Since then, eyeglasses began their evolution, from those without legs to with legs; from those with glass lenses to high index plastic lenses; from those plastic frames to titanium frames, etc..
Then with different requirements of eyeglasses of different people, diverse types of eyeglasses are then invented.
Corrective glasses: the original corrective glasses are used to correct refractive errors of the eye–myopia, hyperopia or astigmatism, etc.. This should the most common type for people in their daily lives.
Safety glasses: they are mostly used by athletes or sports lovers, helping them prevent foreign bodies entering eyes; what’s more, for the fact that there is a greater chance for this kind of glasses to get broken and debris may fly into eyes, safety glasses are usually made with shatter-resistant plastic lenses.
Sunglasses: sunglasses provide protection against harmful rays from the sun, so as to reduce or stop the possibility of the emergence of kinds of eye disease. Additionally, nowadays sunglasses can be of both prescription or non-prescription, that is to say, if you are a person with eyesight problems who has to wear corrective glasses, you can also wear prescription sunglasses which both prevent harmful rays and provide a clear vision.
Presbyopia glasses: they include bifocals, trifocals and progressive lenses. The first two lenses are the traditional ones which have only two or three distinct horizontal viewing area, which are easily to make the wearers dizzy for the sharp transition between the focal points. Unlike the two, the last lenses give a smooth transition, providing the wearers a comfortable feeling.
3D glasses: they are specially designed for people to watch 3D movies. Due to the illusion of three dimensions on a two dimensional surface, 3D glasses can offer each eye with different visual information, making the image more real.
Of course there are many other glasses for different usages, for example glasses for watching the solar eclipse.
As for eyeglass styles, they are of a great variety, ranging from rimless glasses to boxy glasses. At present the most in style is those with thick, black and boxy or round frames, in a kind of restoring ancient way. In street, if you keep an eye on the passersby, you will find a lot of them wearing thick boxy or round glasses of different colors, and some of them even just wear glass frames without lenses, just for fashion.
Firmoo.com is the emerging online optical store selling high quality eyewear, such as prescription eyeglasses (single vision myopic glasses, reading glasses, bifocal and progressive eyeglasses etc.,), prescription sunglasses (with RX tinted lenses), prescription sports goggles. Firmoo guarantees lowest possible price in the market. Firmoo’s return and refund policy makes any purchase risk-free ones.
Article Source:http://www.articlesbase.com/vision-articles/what-do-you-know-about-eyeglasses-1668707.html