In many parts of the world, nearly two out of three people wear corrective eyewear. And lately, many of us have the same complaint: Wearing a mask makes our glasses fog. When we asked readers to send their questions about coronavirus, one of the most commonly asked questions was about how to solve the fogging problem. While the problem is new to us, it’s a daily challenge for health care workers. We asked them for suggestions on how to wear a mask while making sure we’re still able to see through our glasses. Why does my mask make my glasses fog? People who wear glasses already know that eyewear fogs when you walk out of a warm house into the cold outdoor air, or when you open an oven door. When we wear a mask, warm breath can escape through the top edges, along the tops of our cheeks. When the hot air lands on cooler lenses, it creates condensation on the surface and a foggy film. Cold weather makes the problem worse. So how do I stop the fog? You can start by improving...