Contact Lenses May Pose Some Unforeseen Risks

Chad Groeschen, 39, says he developed a bacterial infection from sleeping in lenses marketed for "day and night" wear.
2:28 | 08/26/15

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Transcript for Contact Lenses May Pose Some Unforeseen Risks
This morning contact lens dangers. One man nearly going blind in one eye after sleeping with his lenses in. Tens of millions of Americans wear contacts and ABC's Reena ninan has what you need to know. Reporter: 39 Chad grushand has been wearing contact lenses since he was 18 years old and switched to extended day and night lenses last week but had no idea he was damaging his eyes while he slept and one day last month -- My wish was actually clouded over. I could not see out of it. Reporter: Now with a dangerous bacterial infection in his left eye that's damaging his cornea. His doctor says caused by his sleeping in his lenses. For about three weeks it was almost an eight-inch nail being driven into my eye literally there was no scaping looking at a lie hurt. Reporter: Nearly 41 million Americans wear contact lenses and in a recent study found more tan 50% survivored reported sleeping with their lenses in. 20,000 patients a year develop a pseudomonas infection. I had no idea something like this could happen. Reporter: Chad is now 20% vision in his left eye able to see light and color. While he might still need a cornea transplant Chad's doctor says his condition could have been much worse. If it's left untreated, it can actually cause a person to completely lose the eye. Reporter: To avoid infection doctors say you should avoid wearing contact lenses in the shower or pool. Change your lenses case every one to three months. Use fresh solution and most importantly, take your contacts out before you go to sleep. The risk is over ten times greater in patients who sleep with their lenses. This morning Chad so grateful he caught it in time. I feel very fortunate that I was able to get in here as soon as I did because I do believe they saved my eye. And remember, he was actually following the directions exactly but experts say even contacts marketed as overnight, they should be taken out before you sleep. The contact lens manufacturers association tells ABC news that the risk of an eye infection because of a result of loss of vision, it's only four in 10,000 per year but those tips can make a difference. Yeah, and still very scary. Thank you so much, Reena.

This transcript has been automatically generated and may not be 100% accurate.

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