Shelf life
Unopened blister packs typically last two to three years from manufacture. The date assumes the seal is intact and storage conditions are normal.
Replacement cycle
Daily, monthly or six-monthly refers to wear time after opening, not shelf life. A monthly lens opened in January expires in February, regardless of the box date.
Signs to discard
A lens that is torn, cloudy, discoloured, or that stings on insertion should be thrown away. Do not attempt to clean a damaged lens.
Expired but unopened
Do not use it. Sterility and material integrity are no longer guaranteed.
Recording dates
Write the opening date on the box or in your phone. It is the only reliable way to keep the replacement cycle honest.
Frequently Asked Questions
Can I wear a lens past its replacement date?
No. Surface degradation and biofilm build-up increase risk.
Does the expiry date change after opening?
The replacement cycle applies once opened and is usually shorter than the shelf life.
Is an unopened expired lens safe?
No. Discard it.
