I'm one of the lucky ones whose eyes don't get red after smoking up. It was nice to have going through highschool and its nice to have now when I'm working. College it doesn't matter, most of the profs toke up occasionally too.
I don't use anything. If anyone even asks I just blame it on my contacts...which half the time is true.
My eyes just get glossy...so eye drops don't help much. Even if they did help, it would be too much trouble to put in...lol