There are three very important features of safety glasses: 1. The frames on safety glasses are stronger than typical glasses and are built to prevent the lenses from being pushed into the eyes. 2. Safety glasses have impact resistant lenses. If a large object were to hit you in the face, the last thing you want to deal with is a shattered lens being pushed toward your eye. 3. Safety glasses have side shields. Some safety glasses wrap around your face to prevent objects from being able to get to your eyes, while other safety glasses have clear, impact resistant side shields affixed to the frames. Either style is perfectly acceptable. Source: http://woodworking.about.com/od/safetyfirst/p/safetyGlasses.htm
Safety glasses are eyeglasses that special made to protect the eyes from harm when people do some danger work. Compared normal glasses, safety eyeglasses are with additional safety features that make it less likely to break, or less likely to pose a threat when broken. With it, they can protect the eyes from debrs, sands, wind and intensive sun's rays so as to give eye well protected.