I use squash goggles - with prescription lenses. I also use a product called "cat crap" to avoid them streaming up. It's a very catchy marketable product name don't you think!

Seems to work OK for me - and it's perfectly safe.

You can find it on Amazon here: https://www.amazon.com/gp/aw/d/B002BHWZFI/ref=mp_s_a_1_1?ie=UTF8&qid=1474003974&sr=8-1&pi=SX200_QL40&keywords=cat+crap+anti-fog&dpPl=1&dpID=41QJrvPBofL&ref=plSrch