Swimming goggles fog up because of condensation forming on the inside of the lenses. This is either perspiration or water vapour from your skin. Therefore, it is likely to be worse if you are exerting yourself.
Most swimming goggles will be sold as ‘anti-fog’ treated which means they have a silicone film applied to the inside of the goggles. This helps prevent water ‘sticking’ to the goggles, instead it runs off the lenses, thus preventing fogging.
However, goggles can still fog up for a variety of reasons.
Obviously you can’t stop yourself from generating heat and water vapour, so how do you stop/ minimise the problem of goggles fogging up?
Personally, I find the anti-fog in a new goggle works well but generally for only a matter of a few weeks/months. After that I use an anti-fog spray before every swim and find that solves the problem.
Watch a demonstration showing how to apply anti-fog here:
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