Fell Asleep in Contact Lenses? Keratitis Warning Signs and When to See an Eye Doctor Immediately

Let’s start with the bottom line.

Falling asleep while wearing your contact lenses just once rarely leads to an immediate catastrophe.

In most cases, removing the lenses in the morning and resting your eyes for a day resolves any minor irritation without further issue.

However, the risk of serious complications undoubtedly skyrockets.

According to the U.S. Centers for Disease Control and Prevention (CDC), sleeping in contact lenses increases the risk of contact lens-related eye infections by 6 to 8 times (CDC, MMWR, 2018;67(32)).

A nationwide Australian study revealed that while the annual incidence of microbial keratitis among daytime-only soft lens wearers was 1.9 per 10,000 wearers, it jumped to 19.5 per 10,000 for overnight wearers—an approximately 10-fold increase (Stapleton F et al., Ophthalmology, 2008;115(10):1655-1662).

Therefore, there are only four key signs you must check this morning:

① Sharp, stabbing pain

② Redness that does not subside even after removing the lens

③ Cloudy, hazy vision resembling a thick fog

④ Difficulty keeping your eyes open in bright light (photophobia).

If you experience even one of these symptoms, visit an ophthalmologist today.

If none of these are present, you may rest your eyes from lenses for a day and monitor your condition.

Table of Contents

I fell asleep with my lenses on once. Is it a major problem?

Why does sleeping in lenses increase the risk?

What should I do right now?

Four warning signs requiring an immediate ophthalmology visit

Just redness without pain—can I wait and watch?

What if the pain is unusually severe? Acanthamoeba and water exposure

Does vision fully recover once keratitis resolves?

Aren't daily disposable lenses safe?

Why are color lenses and overseas direct-purchased lenses riskier?

Why is Ortho-K (Dream Lens) safe to sleep in?

Persistent contact lens discomfort: What to check before vision correction surgery

Situations where you must seek immediate medical care

5 Frequently Asked Questions

1. I fell asleep with my lenses on once. Is it a major problem?

Most of the time, you will be fine.

Working late into the night, having drinks, or lying down for "just a minute" only to wake up the next morning is a common occurrence among contact lens wearers.

However, this does not mean it is "safe"; it simply means the **"probability remains low."**

A large-scale nationwide survey conducted in Australia reported the annual incidence of microbial keratitis (corneal infection caused by bacteria, fungi, or amoebae) based on lens wearing modalities as follows: