1. lens materials: lens materials are divided into PC, PMMA and TAC. Among them, PC has the best anti-pollution performance, but it is easy to generate static electricity, so PMMA or TAC is generally recommended. In addition, if there are scratches on the surface of the lens, it will also cause fog on the lens.

2. How to wear it: The wrong way to wear it, such as touching the lens directly with your hands, can easily make the sweat stains on your hands touch the frames, temples, nose pads and other places, which will lead to fogging of the glasses.

3. Air humidity: Water in the air will enter the eyes through breathing, and water vapor will form a thin tear film on the eye surface to play a lubricating role. When the air humidity is too high, it is easy to form a water film on the eye surface. This will cause the glasses to fog.

4. Environment: If the temperature is too high or too low, the eyes will secrete more oil, thus increasing the chance of fogging.

So how to prevent glasses from fogging:

1, keep good hygiene habits, and avoid touching the lenses with dirty hands, so as not to bring bacteria from your hands into your eyes and cause discomfort.

2. Pay attention to personal hygiene, wash your hands frequently and avoid touching your eyes with your hands, especially the metal parts of the lenses.

3. Wash your hands regularly and use special lotion to clean your hands.

4. Try to reduce staying in humid environment for a long time, such as bathroom, sauna, swimming pool, gym, kitchen, etc.

5. Before going out, turn on the air conditioner to dehumidify and keep the room dry.

6. You can wear a mask when you go out, which can effectively block dust and prevent dust from falling on your face.