Specification :

Safety glasses look very much like normal glasses buy have lenses that are impact resistant and frames that are far stronger than standard streetwear glasses. Safety glasses with proper impact and shatter resistance will be marked " Z87" on the frame or lens. Safety glasses must have side shields and should be worn whenever there is the possibility of objects striking the eye, such as particles, glass, or metal shards. Many potential eye injuries have been avoided by wearing safety glasses.