Scary reason you should never wash contact lenses with tap water

If you wear contacts, you're probably very familiar with the rules: Don't wear them overnight, don't wear them swimming, always wash your hands before touching your lenses.

And of course, everyone knows you should always wash your lenses with solution.

Related: What your eyes say about your health:

6 scary things your eyes say about your health
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6 scary things your eyes say about your health

Cataracts are cloudy eyes and are most common in older people. Many times they can be indications of tumors or diabetes. 

Because many people don't think to put sunscreen near their eyes, skin cancer often forms around them. If you see a non-healing sore on your eyelid that may be causing your eyelashes to fall off, it could be time to consult a doctor. 
Droopy eyes on both sides may be a sign of myasthenia gravis, an autoimmune disease associated with muscle weakness. Dr. Hagan explained the disease can range from mild to more serious, deadly forms. 
If your retina is inflamed because of your sensitivity to light, doctors may be concerned with HIV/AIDS. 
Droopy eyelids and differently dilated pupils may be an indication of Horner's syndrome, often associated with tumors or aneurysms.  
Oftentimes, cancer in the body may show up in the eye as well. According to Dr. Hagan, the two most common ones include lung cancer and breast cancer. 

Even though this is rule is well-known, it's easy to skip. You could run out of solution, and decide to use tap water for the time being. Or, you could be traveling, and accidentally leave the solution at home.

The truth is that these easy mistakes could cost you your sight. Like this 18-year-old, who nearly died after being diagnosed with Acanthamoeba keratitis. Her eye was being eaten, all because she left her contacts near her sink -- and a tiny droplet of water infected the rest of the solution.

The CDC reports that it's easy for germs to enter the eye because of its permeability. You can get an amoeba just from showering with your contacts, or sitting in a hot tub. Though the infection is rare, it can be life or vision-threatening.

Luckily for that British teen, doctors were able to find the amoeba before it ate her spinal cord.

So, the CDC is recommending to throw out all contacts if they touch water. Even if your tap water is 'purified', you're still at risk.

Scroll through to see celebrities with different colored eyes:

Celebs who have different, weird and unique eye colors
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Celebs who have different, weird and unique eye colors
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