Why do my glasses always jump? I want a scientific explanation.

There may be many reasons for glasses jumping. Here are some possible explanations: 1. Improper glasses frame: If your glasses frame is too big or too small, it will cause glasses to jump. Too large a frame will make the glasses too loose, and too small a frame will make the glasses too tight, causing the glasses to jump. 2. Uneven bridge of the nose: If your bridge of the nose is uneven, or the bridge of the nose is too low or too high, it will be difficult to find a suitable position to fix the glasses, causing them to jump. 3. Eye position change: When your eyes move or your skin changes due to temperature, humidity and other reasons, your glasses will also jump. 4. Loose glasses: If your glasses are often taken off or put on your forehead, it is easy to cause the frame to be deformed or loose, making the glasses jump. 5. Migraine or eye fatigue: When you feel headache or eye fatigue, your muscles will become tense, which will cause your glasses to beat. To sum up, there may be many reasons for jumping glasses, and different countermeasures are different. I suggest you go to a professional optical shop to get glasses, and ask professionals how to wear and maintain glasses correctly to help you solve the problem of glasses jumping.