Three kinds of Optical Glasses

Three kinds of Optical Glasses

Three kinds of Optical Glasses

Do you know what optic is? In dictionary, it means: referred to the eye or the eyesight. As for optical glasses we can easily say they are a kind of device worn on eyes to help people correct their vision or eye protection. The most important part that refers to function is the lenses. They are exactly called optical lenses which have perfect or approximate axial symmetry that transmits and refracts light. Till now, there are two kinds of lenses: glass and transparent plastic. The glass lenses may easily get break while the latter not. In some cases, a set of simple lenses with a common axis are combined to form a compound lens. And a single lens has just a single optical element. In the long history of glasses, lenses have played an significant role. And with the improvement of technology, many different lenses and additional elements have been used in glasses, which enable manufactures to make various glasses, especially the optical glasses.

Currently, there are three kinds of optical glasses: prescription eyeglasses, sunglasses and protective goggles. People made the classification mainly based on the functional differences and neglects of some combinational products. They are given the same wider concept simply because all of them use optical lenses. The first category is well-known and commonly used. Regardless of special eye conditions or cosmetic factors, there are mainly four vision conditions that require the use of regular prescription eyeglasses, namely, myopia, hyperopia, astigmatism and presbyopia. A common place among these four types of Rx eyewear is that their lenses have specific power or powers.

Optics glasses have another two branches: sunglasses and protective goggles. The help offered by these two forms is commonly considered less critical. This can be simply proven by the figure of sunglasses users and that of Rx eyeglass users. It is necessary for those who have poor eyesight to use prescription spectacles. But most people wear sunglasses and protective goggles just for additional eye protection. Even though it is a fact, most eye care practitioners concentrate the use of sunglasses and safety eyeglasses as often as they can.

This is the categories of optical glasses. People have got the functional differences and elements of optical glasses. Next time when shopping online, select the right and best optical glasses for yourself.

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