Coronaviruses form a large family of viruses that can cause the common cold and, in rare circumstances, more serious diseases like SARS (severe acute respiratory syndrome) and MERS (Middle East respiratory syndrome).
Eye strain is common. It happens when you use your eyes to concentrate on something for a long time. Lots of things can cause eye strain, but there are actions you can take to prevent it too.
You can get sun damage on windy, cloudy and cool days. Sun damage is caused by ultraviolet (UV) radiation, not temperature. A cool or overcast day in summer can have similar UV levels to a warm, sunny day.