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By Phillip Yuhas

Your appearance won't be the only frightening thing about wearing costume contact lenses this Halloween. Your eyes might look like a lizard's for an evening, but the risk of permanent vision loss may not be worth the temporary thrill.

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Wikimedia Commons / CC BY 3.0

Contact lenses may appear harmlessly soft and small, but a big chunk of American users are improperly disposing their used lenses and adding to the planet's microplastic problem, Arizona State University researchers found.

In a survey of 409 wearers, about 1 in 5 responded that they flushed their used lenses down the toilet or sink instead of throwing them in the trash, according to a new study presented at the American Chemical Society's National Meeting and Exposition.

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