Acanthamoeba keratitis is a relatively rare eye disease that can occur in contact lens wearers, caused by an amoeba that can be found in lake water, pool water, ocean water, soil, and even tap water. It is difficult to treat and therefore often leads to permanent vision loss. How can you prevent this disease from occurring? By following proper contact lens hygiene, of course! This includes replacing your contact lens case at least every 3 months, maintaining proper contact lens cleaning/storage habits, using a doctor-recommended contact lens solution, not reusing contact lens solution, and not swimming or showering with your contact lenses in your eyes.