Re: expired contact lenses
there's a difference between lenses being "expired" and wearing monthly's for more than a month.
wearing monthly's for more than a month after opening them (if you only wear them a few times a week) is okay as long as you clean them well and don't wear them more than 30 days in total. they get crap on them, it builds up, possibly bacteria too, so you don't want to keep them hanging around for ages. even if i didn't wear them 30 days, i wouldn't keep them more than 2 months from opening.
if the lenses are past their EXPIRY DATE on the packet (this is usually a few years) then throw them away.