| When asked what bothers them most, almost all | | | | they will not shatter. And the most widely used |
| eyeglass wearers will list a lot of items, like | | | | shatter-resistant lenses are made from a kind of |
| maintenance, scratch, deformation, etc. Of these | | | | polymer, called polycarbonate. Polycarbonate |
| listed troubles, eyeglass' vulnerability to impact and | | | | eyeglasses can withstand very strong impact and |
| shatter is proved to be the greatest one. In other | | | | can well protect wearers' eyes. As for the |
| words, what most eyeglass users worry most | | | | frames, they are originally made from metal and |
| while wearing is the durability of these eye wear, | | | | other natural materials, which will deform easily |
| for they can not tell when their eyeglasses will be | | | | after impact. And such situation is not changed |
| broken or crashed due to their carelessness. | | | | though some new materials are invented until the |
| Therefore, some durable glasses are necessary | | | | employment of titanium and other memory |
| for them. Generally speaking, most eye wear in | | | | metals. These special materials can rebound to |
| the market are not designed in durable materials, | | | | their original shapes after being bended and |
| which are used to be very expensive and can not | | | | twisted. |
| be afforded by the massive people in the | | | | On the whole, durable eyeglasses are loved by |
| not-distant-past. However, durable eye wear can | | | | almost all glasses wearers, particularly sportsmen |
| now be afforded by common wearers as | | | | and kids. The magic power of these eye wear |
| technology and techniques in the field advances | | | | can not be easily detected in daily lives, but in |
| greatly. This is why so many wearers tend to | | | | particular situations. For example, people who |
| protect their eyes with eyeglasses with great | | | | often play sports games and other related |
| durability. | | | | activities can benefit greatly from these durable |
| The reason why these eye wear are so durable | | | | eyeglass wears. These glasses will not break into |
| mainly lies in the materials. Generally speaking, eye | | | | pieces or deformed though attacked by great |
| glasses are composed of two major parts, | | | | impact. As for kids, they are also the best |
| namely, the lenses and the frames. Therefore, | | | | candidates for durable eyewear. Kids may pay |
| durable glasses are also made from unique lenses | | | | little to what will happen when they are playing. |
| and frames. From the perspective of history, the | | | | Therefore, what bothers parents most are |
| lenses of traditional eyeglasses are mainly made | | | | eyeglasses in the past. And now, durable glasses |
| from glasses, which may break into pieces and will | | | | with great power in resisting any impact and |
| harmfully injure wearers' eyes. Later, some plastic | | | | shatter have this problem easily resolved. |
| lenses are invented; they also break easily, though | | | | |