The Advantages of Refractive Cataract Surgery

Glass- the earliest material used to make sunglasses lenses. Glass is very traditional materials but is still very popular among some wearers. It has many merits, like great optical acuity, relatively cheap, etc. On the contrary, it is fragile and broken easily, heavy to wear, etc. But some new glass in the industry has maintained its merits and overcome the aforesaid defects.
Polycarbonate is now one of the most popular materials employed to make blue sunglass lenses. Traditional lenses are very fragile or cannot stand very strong explosive. And polycarbonate lenses are totally different- they can combat very fierce shatters and are first choices for many sportsmen.
Metal is the most traditional materials used to make blue sunglass frames. According to some data, the earliest real sunglasses are made from metal frames. Metal frames are very hard and can help firmly fix the sunglasses onto the wearers' heads. But metal will be out of shape if not handled properly. Or even some people are sensitive to metal frames- but some special coating on them can help solve this problem. Now, some memory metal is very popular and can help avoid its original demerits.
Titanium is one of the latest materials used to make blue sunglasses frames. It has the merits of both plastic and metal- lightweight and strong. And now there are still memory titanium- a much-advanced material than common titanium.





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