The pieces of glasses are easy to hurt your eyes and make eye infection. During fighting, pay attention to protect face. If your opponent attack your face or eyes, you may easily get black eyes. Black eyes are most often because of face or eye injury, which is really hurt and make your appearance very horrible. What's worse, black eyes can cause eye infection easily. That is, irritation, redness and pain will occur soon. The ideal and safe way to protect your eyes when fight is wear contact lenses. This kind of contact lenses can reduce the risk of hurt by pieces of glasses and increase attention to your opponent.