It's not "night blindness" .. it's a halo effect ...
At night, for a little while whenever i'd look at a street light it would give me a halo effect.. it's not bad at all.. just imagine you're driving in the rain and looking thru the windshield... the halos are there but it's not night blindness or anything.
Trust me, my girlfriend and I both had lasik and she never saw a halo.. i did but it's not bad at all.
Read this:
http://www.hon.ch/News/HSN/514315.html