Here's a news flash that won't come as much of a surprise if you wear contacts: According to a recent study by scientists at NYU Langone Medical Center, you're more likely to get an eye infection than people who don't wear contacts.

Yes, this could probably be filed under "You Needed a Study to Figure This Out?" and yes, we're guessing you already know the importance of washing your hands before you stick your finger in your eye. But if you're one of the many people who don't wear disposable contacts (in 2012 only 5 percent of Americans wore daily-use lenses), there's still one thing we'd bet you're not doing: changing your case every three months.

This part of your routine is more important than you'd think. Susan Resnick, a New York City optometrist, told us that these plastic cheapies are a virtual petri dish. "The case itself is a potential reservoir for unwanted germs," says Resnick. "Switching it out routinely, in addition to rinsing it with solution daily, is necessary to prevent any contamination due to buildup of debris."

So here's your new rule: The next time you buy a new bottle of solution, throw away your old contact case. That's the reason most come with a complimentary case in the first place.

For more news on contact lenses, read these:

Why You Need to Be Careful When You Buy Contact Lenses

Can Contact Lenses Make You Look Younger?

Tips for the Makeup-Loving Contact-Lens Wearer