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For many people, contact lenses are a convenient alternative to glasses. They provide clear vision, greater freedom during sports and daily activities, and eliminate the hassle of fogged-up lenses. However, one common habit can put your eye health at serious risk: sleeping while wearing your contact lenses.
It may seem harmless to leave your lenses in after a long day, especially if you’re exhausted or accidentally fall asleep on the couch. But eye care professionals have warned for years that this seemingly small mistake can lead to significant problems, ranging from mild irritation to severe eye infections that may threaten your vision.
Why Sleeping in Contact Lenses Is Risky
Your eyes need oxygen to stay healthy. Normally, oxygen reaches the cornea—the clear front surface of your eye—directly from the air. Contact lenses create a barrier that reduces the amount of oxygen reaching the eye.
When you close your eyes during sleep, oxygen levels naturally decrease even further. If you’re also wearing contact lenses, your corneas receive even less oxygen, creating an environment where bacteria and other microorganisms can thrive.
This combination of reduced oxygen and increased moisture makes your eyes more vulnerable to infection and irritation.
What Can Happen?
1. Eye Irritation
One of the first signs of trouble is simple discomfort. You may wake up with:
- Red eyes
- Dryness
- Burning or stinging sensations
- Blurred vision
- Excessive tearing
Although these symptoms sometimes disappear after removing the lenses, they should never be ignored if they persist.
2. Corneal Abrasions
Sleeping in lenses can make them stick tightly to the eye’s surface. Removing them afterward may scratch the cornea, creating tiny injuries known as corneal abrasions.
Even small scratches can become painful and increase the risk of infection.
3. Eye Infections
Perhaps the biggest concern is infection.
Bacteria that would normally be harmless can multiply beneath a contact lens. If they enter tiny scratches in the cornea, they may cause infections requiring prompt medical treatment.
Common symptoms include:
- Severe redness
- Eye pain
- Sensitivity to light
- Swelling
- Thick discharge
- Blurred or reduced vision
These symptoms should be evaluated by an eye care professional as soon as possible.
4. Corneal Ulcers
A corneal ulcer is an open sore on the eye’s surface that can develop when an infection becomes more serious.
Treatment often involves prescription eye drops and close monitoring. Left untreated, corneal ulcers can result in permanent scarring and vision problems.
Does It Matter Which Type of Lens You Wear?
Some contact lenses are specifically approved for extended or overnight wear. Even with these specialized lenses, sleeping in them may still increase the risk of eye complications compared to removing them before bed.
Eye care professionals generally recommend following the exact wearing schedule prescribed for your lenses.