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Basically it crawl into your eyes through infected contact lens, if can cause you to grow blind if not treated properly.
This kind of worms are very commonly found inside water. The only way to get them is only to have the contact lens to come in contact with water through swimming/bathing/showering. Unhygienic practice while handling the contact lens (not cleaning it properly) will allow this kind of worms to continue to remain inside the contact lens.
The condition is know as Acanthamoeba Keratitis
How Can You Reduce the Risk of Getting Acanthamoeba Keratitis?
There are several easy ways to greatly reduce the chance of getting this sight-threatening condition — and, in fact, any type of contact lens-related eye infection:
Follow your eye doctor's recommendations regarding care of your contact lenses.Use only products that he or she recommends.
Never use tap water with your contact lenses. Do not swim, shower or use a hot tub while wearing them. If you do decide to wear your lenses while swimming, wear airtight swim goggles and afterward dispose of the lenses immediately.
Be sure to soak your lenses in fresh disinfecting solution every night. Don't use a wetting solution or saline solution that isn't intended for disinfection.
Always wash your hands before handling your lenses.
Unless you are wearing disposable contact lenses that are replaced daily, always clean your contacts immediately upon removal, rubbing the lenses under a stream of multipurpose solution — even if using a "no-rub" solution — and storing them in a clean case filled with fresh (not "topped off") multipurpose or disinfecting solution.
Google Acanthamoeba Keratitis for more.
This post has been edited by Nosuke: 03 April 2011 - 05:26 PM
Minegarde's friendly Succubus 
