In reply to timparkin:
I have Bolle Bedrock which are Cat 0 clear googles, about £35 rrp but you might find them for a bit less. Possibly not reasonable budget though...
Mountain bike goggles are another option and often cheaper than ski or mountain brand ones. I found them way too big for me though hence bought the Bolle ones as they actually fit me.
I've used mine at night in disgusting weather on the Cairngorm plateau doing night navigation and no issues.
Post edited at 16:16