Replica sunglass lenses are usually just tinted pieces of regular clear plastic, while name brand lenses are  high quality polymers treated with various light dampening techniques. Replica sunglasses often do not have the same amount of UV protection as brand name glasses. UV radiation is the cancer-causing component of sunlight.  These glasses also lack polarization and other glare reducing measures.

When buying wholesale replica sunglasses, it is important to keep these things in mind. Make sure to look for the amount of UV protection, since blocking these rays is the most important job your sunglasses have. It is possible to find bargain sunglasses with good UV protection, but these are much rarer than the sun glasses without.  It is always good to remember the classic saying, you get what you pay for.