You can get ESS Advancer V12 goggles with the RX insert:
http://www.esseyepro.com/Advancer---...19_detail.html
I've got a pair, they only started to fog after i ran and sat still for a minute, I just clicked open the lenses and they defogged in 5 seconds. They have a neat feature, advancing lenses, in a nutshell it increases airflow over the lenses without decreasing safety.