Keeping your glasses from fogging in the middle of an activity can mean the difference between a successful project and one ending in an accident. Foggy glasses can be caused by drastic differences in temperature on either side of the lens, but the fogging that results can be avoided.
Safety glasses and goggles are used to shield your eyes from debris or harmful fumes and stray materials. Using safety glasses and goggles with an anti-fog coating can increase your visibility during an activity. Anti-fog coatings come in both grayish and clear varieties, depending on the needs of your safety glasses. This coating also doubles as a UV-ray blocker and makes the surface of the glasses scratch resistant. Examples are glasses from Pyramex and ESS, both available from Safety Glasses USA (safetyglassesusa.com).
Sports glasses are those used during sporting events such as skiing, snowboarding, swimming, and air soft competitions. Increased visibility during these sports is crucial, since you can easily get into an accident, should you miss something in a split second. The anti-fog coating works by transforming water droplets into thinner sheets, making them spread across the surface to reduce the blurring effect for the wearer.
When you are out in the snow, the combination of body heat and cold air can fog up ordinary goggles very quickly. Ski goggles have double lens construction to stop fog build up. Look for a pair of ski goggles with adjustable vents around the lens perimeter to allow you to control the ventilation. Check also for thick and absorbent foam on the frame to stem the flow of sweat on your face. Fitted goggles with frames are better than frameless ones because the frames prevent snow from getting under the lens which can impair your vision.
For those who need several anti-fog glasses, a more economical approach is to buy anti-fog solutions, which you can apply to several regular glasses and goggles. Anti-fog solutions come in spray, mist and wax form, often with a soft buffing cloth to help you evenly distribute the coating on to the glasses' surface. Examples of anti-fog solutions are those from Zooke (zooke.com) and Defog It (defogitworks.com). These solutions can also be applied to camera lenses, which are often victims of fogging, too.