Activities as ordinary as entering warm to cold environments or simply experiencing the winter weather outside can fog up your lenses. Foggy glasses are more than a simple annoyance-they cause temporary blindness and can lead to truly dangerous situations. You don't have to avoid your daily activities to fend off fog from your lenses. Here are three ways to minimize or avoid the fog this winter: Firstly, dress less. While outdoors, be careful not to overdress. Wearing too many layers of clothing can cause your body to overheat and sweat more, creating fog on your lenses as your body heat rises.Secondly, talk to your eye doctor. Ask about lenses specially designed to protect against fog, such as Optifog lenses, which have patented fog repellant properties on both the front and back side of the lens. Simply cleaning Optifog lenses with the Optifog Activator Cloth provides long-lasting protection against fog.Thirdly, wear a headband. When involved in physical activity, condensation can build up on your lenses. Wear a headband to absorb any sweat produced by your body to potentially help reduce fog.