Simply throw out the old lens and replace it with a fresh lens. According to the expiration date on my package of lenses, they have expired. As long as the lens is still snugly sealed in its foil package with no leakage of any solution, and the lens remains in its hydrated state within the sterile package, it is safe to use. Dk is the rate the oxygen can flow through the lens. Disposable wear means single use of the product and does not normally involve use of lens care solutions.
Frequent replacement includes product reuse, disinfection, and planned replacement.
The lens is cleaned and disinfected each time it is removed from the eye. Check with your Eye Care Professional for the wear schedule that is appropriate for you. The lens cannot get lost behind your eye, so relax. The lens should work itself around to where you can see it by itself. Then, after washing your hands with soap and water, remove the lens.