Using Expired Contact Lenses

contact lenses
A thin plastic lens placed directly on the surface of the eye to correct visual defects
(contact lens) contact: a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication
(contact lens) A thin lens, made of flexible or rigid plastic, that is placed directly on to the eye to correct vision, used as an alternative to spectacles, or, if coloured, to change one's eye color cosmetically
(Contact lens) A small plastic disc containing an optical correction that is worn directly on the cornea as a substitute for eyeglasses.

expired
having come to an end or become void after passage of a period of time; "an expired passport"; "caught driving with an expired license"
(expiration) termination: a coming to an end of a contract period; "the expiry of his driver's license"
(expiration) passing: euphemistic expressions for death; "thousands mourned his passing"
(of a person) Die
(of a document, authorization, or agreement) Cease to be valid, typically after a fixed period of time
(of a period of time) Come to an end