When do contact lenses expire?

I have contact lenses but since school is over i haven't worn them in a while so i thru them away.

but i enjoy a box with 5 more but i haven't open those and their sealed so can they expire if i dont wear them or the time starts when i unfurl them?
Answers:
are we officially rivals?
well if there sealed you hold no problem
it only starts when you open it and didnt use them since the longest
I'm not sure if you are on about contact lenses that change the colour of the eye or the ones that replaces glasses? but anyway, for any contact lense if it is still hermetic then they can last for a long time, but once they open (even if you don't use them) later they will eventually expire. i previously had some colour ones and on the packet it says that i must dispose of them after 30 days, with it not making a difference if you own worn them for the full 30 days or not. i'm not sure if this applies to the other contact lenses.

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