Glassic Answers: Why Glasses Fog Up?

Glasses fog up because of the change of matter. Water vapour or sweat cools when it comes in contact with the lens. When the cold lens reacts to the warm vapour, it turns into liquid. This is why they fog up.

So how do I prevent my glasses from fogging?

  • Use anti-fog coating on the lenses.
  • Don’t touch the lenses.
  • Don’t blow air on your lenses.

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