Can I still use contact lenses solution if it is expired?

[New Miami]

I have a bottle of solution for contact lenses already expired last year,but I have never opened it before. Can I still use it?

[New Middletown]

After the expiration date, the cleaning effect of the solution will diminish.That is to say, the pH level will become unstable.Thereby the solution may not clean the proteins and bacteria off your contacts as well as it should be, so you are probably get eye problems, such as irritation, itchy eyes, blurriness, and infection.

[New Holstein]

It wouldn't be safe to use that. Some of the component in the solution may be deteriorated after it is expired. If you contibue t o use it, the lenses would be infected and cause some eye diseases.