do contact lens solution expire as per the date on the bottle or can be used a little longer?

Posted 23rd Jan 2015
my sister has ignored her contact lenses and left the solution bottles for months.she complains that its because she is busy with kids and its difficult task to keep up with things.really? i dont believe her.but dont disagree completely.

sorry digressed. she has around 10 bottles of solution which have either expired in 07/2014 or 12/2014
can she still use them or has to buy new ones?

thank you
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