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In page Contact lens:

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Contact lenses are generally safe as long as they are used correctly. Complications from contact lens wear affect roughly 5% of wearers yearly.[1] Factors leading to eye damage varies,[2] and improper use of a contact lens may affect the eyelid, the conjunctiva, and, most of all, the whole structure of the cornea.[1] Poor lens care may lead to infections by various microorganisms including bacteria, fungi, and the amoeba Acanthamoeba (Acanthamoeba keratitis).[citation needed]