Eyeglasses for vision correction are needed by a large number of people in the world. They come in a wide variety of styles and countless models. Before reaching a certain age, people who have a visual refractive error or presbyopia will continue to suffer deteriorating eyesight. In this case, it is an inevitable action to buy new lenses if they use prescription eyeglasses. The practice is similar if vision-defected individuals use prescription contact lenses. This need for a higher degree of vision correction will occur especially in the first years after getting a vision problem. This has been widely complained by lots of people. And a small group of eye care doctors even believe that the use of Rx eyewear or contacts is the root cause of the deteriorating eyesight. Regardless of the correctness of this saying, unbreakable glasses are a natural and popular choice among most eyewear users.
The reason for unbreakable eyewear’s extreme popularity is that a durable frame can continue to function even if the lenses should be replaced by heavier ones. In most cases, Rx eyewear users in their 10s and 20s need to have their lenses replaced every year. This is because the old lenses can no longer provide adequate vision correction due to the poorer eyesight. Buying new lenses frequently means much expense. However, this is largely indispensible for clear vision is a necessary condition in lots of tasks. For people who have not an adequate budget for eyeglasses, choosing a durable frame is a good choice. A pair of unbreakable glasses can last several years until it is too old to use. Even if the lenses have been replaced for several times, the durable frame can hold the lenses stably and function well.
The selection of unbreakable glasses depends mainly on the frame material. Eyeglass and sunglass frames can be made of metals, plastics as well as unusual materials like horn and leather. Some of them can hardly be considered durable. Most plastics are flexible enough, but are not durable. One category of materials includes memory metal and memory plastic. These are really advanced materials featuring extreme durability. Moreover, titanium and related alloys are also good options.