Cold lenses plus warm air equals condensation. Water vapor in the air transforms into liquid form when the temperature changes and that liquid clings to a surface—in this case, your lenses. When the fog clears from your lenses, the opposite happens—the liquid evaporates, turning back into a gas. Taking your glasses off and holding them in front of a blowing vent or waving them around gently can speed up this process, but wouldn’t it be nice to avoid the foggy...

Sunglasses are a beach essential, and you’ve probably got a pair or two in your car for your daily commute—but are running sunglasses necessary? Running without sunglasses may mean squinting into the sun, which—in addition to being annoying—can cause eye strain. You’re also leaving your eyes vulnerable to UV rays, debris, wind, and more. Though something is better than nothing, throwing on any-ol’-pair of sunglasses won’t cut it when it comes to your daily run. If you’re dealing with eyewear...