River Blindness

This microscopic amoeba has a long name - Acanthamoeba keratitis - and a long rap sheet to match. If you wear contacts and like to camp, be extra careful about how you clean and insert your lenses. Make sure your hands are clean when you touch your eye, because acanthamoeba can invade the cornea, causing an infection that can lead to blindness. Acanthamoeba is common in nature and can be found in water, soil, and air.

Credit: Discovery/Animal Planet