Different Materials For Glasses And Contact Lenses

Thanks to the creation and fast development of eyeglasses and contact lenses

, which enable people with poor eyesight to have a clear vision of the world. Nowadays, there are a wide variety of eyeglasses and contact lenses available in different materials. Just because of this, people can have their choice according to their specific needs. In order to choose the one most suitable for you, please read the following introduction on different materials for glasses and contact lenses.

Eyeglass has a long development history and its materials mainly include the following: the oldest type is the one made of glass. This kind of glass is scratch resistant, which enables people to see clearly and at a lower price. Compared with other materials, glass is thicker and heavier. Usually, the higher prescription people have, the heavier and thicker eyeglass they need to wear. So this kind of eyeglass is mainly prescribed to people with minor eye problem.

Eyeglasses made of plastic are the most popular in the United States. It is economical, lighter than glass lens, and can also offer people with a clear vision. Another advantage is plastic lens can be tinted to sunglasses, while glass lens can not. However, it is also thicker with strong prescription.

Polycarbonate lens is the second most popular lens in the United States. It has the benefits to be safer, lighter and thinner. Besides, it is extremely impact resistant, more than 10 times impact resistant than glasses according to studies. And it can also offer us with a 100% harmful UV rays blocking.

High index lens is made of thinnest material on the market, which is made of glass or plastic. Compared with common plastic lenses, the thickness of high index lens is only 25% to 65% of plastic. And it can also give people 100% UV protection.

For contact lenses, they also have a long history of development since the creation 120 years ago. Contact lens mainly has two types: hard lens and soft lens. At the beginning, the contact lens was made of polymethyl methacrylate, which can make people comfortable to wear. But it also has a disadvantage that it may cause people some side effects as oxygen can not get through the lens to our eyeballs. Then gas permeable lens are created, which is made of polymers. So it can not only enable people to have a clear vision, but also comfortable to wear. Whats more, it can be used longer, and also has the function of stopping our eyes from outside chemicals and fumes.

Soft contact lens is made of hydrogel or polymacon, which is more comfortable to wear as it can allow more oxygen to get into our eyes. But it can not be used as long as hard lens. There are a wide range of soft lenses available. If we dont like to clean and maintain lenses, we can choose some disposable lenses which can be discarded after a certain time of use.

by: homas Carter

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