I was originally nearsighted, and now I feel blurred. Is it because the weather is too hot? Or what happened.

Sunny days are different from cloudy days, and the change of light will make people mistakenly think that their vision is blurred. In addition, physical changes, such as colds and fever, can also cause short-term vision loss. But hot weather won't change your eyesight. You can do a test. Maybe your eyesight has really declined. Avoid strong light and wear sunglasses when you go out in summer. In addition, you sweat a lot in summer, so be careful not to let sweat flow into your eyes and pay attention to eye hygiene.