Contact Lens Safety • Eye Health • Corneal Care
The Dangers of Sleeping in Contact Lenses
It may seem harmless to leave your contacts in overnight, but doing so significantly increases your risk of serious eye infections and permanent corneal damage.
Falling asleep with contact lenses in is one of the most common and risky habits among lens wearers. Even a single night of sleeping in lenses you are not approved to wear overnight can create conditions that allow dangerous bacteria to thrive on your cornea.
At Upper West Optical, contact lens safety is a core part of how we care for our patients. Understanding the real risks helps you make better decisions every day.
Why Sleeping in Contacts Is Risky
Oxygen Deprivation
Your cornea relies on oxygen from the air rather than blood vessels. Contact lenses already reduce oxygen flow, and closed eyelids during sleep reduce it further, stressing corneal tissue.
Bacterial Growth
The warm, moist environment under a contact lens is ideal for bacterial growth. Overnight wear dramatically increases the risk of microbial keratitis, a serious corneal infection.
Reduced Tear Clearance
Blinking helps clear debris and bacteria from the eye surface. During sleep, this mechanism is absent, allowing contaminants to remain in contact with the cornea for hours.
Potential Complications
Corneal Ulcers
Bacterial or fungal infections from overnight lens wear can develop into corneal ulcers, open sores on the eye surface that may cause permanent scarring and vision loss if untreated.
Keratitis
Microbial keratitis is a potentially sight-threatening infection of the cornea. Sleeping in lenses is one of the leading preventable causes of this serious condition.
Corneal Neovascularization
Chronic oxygen deprivation from overwear can cause blood vessels to grow into the normally clear cornea, permanently affecting vision clarity and contact lens tolerance.
⚠ Warning Signs to Watch For
- Redness or irritation that does not clear after removing lenses
- Unusual pain or sensitivity to light after overnight wear
- Blurred vision that persists after lens removal
- Discharge or crusting around the eyes upon waking
- A feeling that something is stuck in your eye
- Swollen or puffy eyelids not explained by allergies or fatigue
Safe Contact Lens Habits to Follow
Follow the Schedule
Only wear lenses for the duration approved by your eye doctor. Daily disposables should be discarded every night, and extended-wear lenses have specific maximum wear periods.
Use the Right Solution
Always clean and store reusable lenses in fresh multipurpose solution. Never top off old solution or rinse lenses with water, which can introduce dangerous microorganisms.
Keep Glasses Available
Having an up-to-date pair of glasses means you always have a safe alternative when your eyes need a break, you feel unwell, or you need to sleep unexpectedly.
Best Practices for Contact Lens Wearers
- Remove lenses before sleeping, napping, or swimming
- Replace lens cases every one to three months
- Wash hands thoroughly before handling lenses
- Attend annual contact lens exams to ensure your fit and prescription are current
- Never share contact lenses with another person
- Carry rewetting drops to maintain comfort throughout the day
Schedule Your Contact Lens Exam
Whether you are new to contact lenses or a long-time wearer, a professional fitting and annual follow-up at Upper West Optical ensures your lenses are safe, comfortable, and right for your eyes.
Schedule Appointment