They should have a use by date on them. I know that saline can usually be kept, sealed, for about 2 years, so I would think they would be fine. If in doubt phone your local Specsavers!
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Well it ain't no secret
I've been around a time or two
Well I don't know baby maybe you've been around too
Well there's another dance
all you gotta do is say yes
And if you're rough and ready for love
honey I'm tougher than the rest
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