Millions of people wear contact lenses safely every single day. But lenses aren’t risk-free — and a little redness or irritation can occasionally be the early sign of something more serious. The good news is that most contact lens infections are preventable, and catching the warning signs early makes all the difference.
This guide walks through the symptoms worth watching for, which ones signal an emergency, what causes infections in the first place, and how to keep your eyes healthy. One thing to keep in mind throughout: this is general information, not a diagnosis. If you think you have an eye infection, the safest move is always to remove your lenses and see an eye doctor.
Why Contact Lens Infections Happen
Contact lenses create a warm, moist environment against your eye — which, without proper care, can become an ideal place for bacteria, fungi, and parasites to grow. Most infections trace back to a handful of avoidable causes:
- Poor hygiene — not washing your hands before handling lenses, skipping proper cleaning, or using a dirty lens case.
- Overwearing or sleeping in lenses — this reduces the oxygen reaching your cornea, weakening its natural defenses and leaving it more vulnerable.
- Water contamination — rinsing lenses with tap water, or swimming and showering in them, can introduce dangerous microbes.
- Reusing solution — “topping off” old solution instead of using fresh disinfectant each day allows germs to build up.
The most common contact lens infection is keratitis, an infection of the cornea. In serious cases it can scar the cornea and threaten your vision — the American Academy of Ophthalmology has detailed guidance on how keratitis develops and why early treatment matters.
Who’s Most at Risk?
Anyone can develop an infection, but some people need to be especially careful:
- People who sleep in their lenses or wear them longer than recommended
- Those who skip proper cleaning and storage steps
- Swimmers and people who shower in their lenses
- Wearers with dry eyes, allergies, or conditions like herpes simplex
- Children and young adults, who may find strict hygiene harder to maintain
Common Symptoms of a Contact Lens Eye Infection
Spotting an infection early helps prevent more serious problems. The most common warning signs include:
- Redness — eyes that look unusually red or irritated
- Pain or discomfort — in the eye itself or around the eyelids
- Excessive tearing or discharge — more watering than usual, or unusual discharge
- Light sensitivity — discomfort in normal or bright light
- Blurred vision — a loss of clarity or sharpness
- A gritty, foreign-body feeling — like something is stuck in your eye that won’t rinse or blink away
If you notice one or more of these, the right response is simple: stop wearing your lenses and contact your eye doctor. An eye infection won’t clear up on its own, and continuing to wear lenses can make it worse.
When It Becomes an Emergency
Some infections can progress within hours. Seek urgent medical care right away if you experience:
- Severe eye pain that doesn’t ease, even after removing your lenses
- Sudden or worsening blurred vision
- Extreme light sensitivity — unable to tolerate even low light
- Unusual discharge that looks abnormal
- A persistent feeling that something is stuck in your eye
These signs can point to a serious infection like microbial keratitis, which in the most severe cases can lead to lasting vision loss. Don’t wait it out — get seen as soon as possible.
How to Prevent Contact Lens Infections
The vast majority of infections are preventable with a few consistent habits. Eye doctors often sum up the essentials this way:
- Wash your hands thoroughly and dry them before touching your lenses.
- Never use water on your lenses — only fresh, store-bought disinfecting solution made for your lens type.
- Don’t reuse or “top off” solution. Empty the case and refill with fresh solution every time.
- Follow your replacement schedule. Whether your lenses are daily, bi-weekly, or monthly, replace them on time — a 30-day lens means 30 days, not longer. If you’re unsure how to manage your order schedule, here’s how easy it is to reorder your lenses on time so you’re never tempted to stretch a pair past its limit.
- Don’t sleep in your lenses unless they’re specifically approved for overnight wear. Give your eyes a regular break.
- Skip water entirely — no swimming, showering, or hot tubs in your lenses.
- Replace your lens case every one to three months, since old cases harbor bacteria.
- Never share lenses with anyone else.
A helpful rule many optometrists share: don’t sleep, swim, or shower in your contacts. Those three habits cause a large share of preventable infections.
If you only take away one prevention tip, make it this — daily disposable lenses carry the lowest infection risk, because you start every day with a fresh, sterile pair and never reuse them.
How Eye Doctors Treat Infections
Treatment depends entirely on the type and severity of the infection, which is why a professional diagnosis is essential. Generally, an eye doctor may prescribe medicated drops — antibiotic, antifungal, or antiviral, depending on the cause — and will usually advise stopping lens use during recovery. Replacing your old lenses and case helps prevent reinfection, and artificial tears may be recommended to ease dryness.
In severe or advanced cases, additional procedures may be needed. The earlier you’re seen, the more straightforward treatment tends to be — another reason not to delay if symptoms appear.
Keeping Your Eyes Safe
Contact lenses are a safe, effective way to see clearly for millions of people — and good habits keep them that way. Wash your hands, care for your lenses properly, stick to your replacement schedule, and never sleep, swim, or shower in them. Want to understand more about the eye conditions that can develop when infections go untreated? Our guide to common eye diseases covers what to watch for and when to act.
This article is for general information only and isn’t a substitute for professional medical advice. If you’re experiencing eye pain, vision changes, or other concerning symptoms, please contact an eye care provider.
Frequently Asked Questions
Can you get an eye infection from wearing contacts too long?
Yes. Overwearing lenses or sleeping in them reduces oxygen to the cornea and creates conditions where bacteria can thrive, raising your infection risk. Always follow your prescribed replacement and wear schedule.
What are the first signs of a contact lens eye infection?
Early signs often include redness, irritation, excessive tearing, a gritty feeling, and mild light sensitivity. If these appear, remove your lenses and contact your eye doctor.
Will a contact lens eye infection go away on its own?
No. Eye infections don’t resolve on their own and can worsen quickly. Continuing to wear lenses can make things worse. See an eye doctor promptly for proper treatment.
Can I wear my contacts while my eye is infected?
No. Stop wearing lenses at the first sign of infection. Wearing them can worsen symptoms and delay healing — and you’ll likely need fresh lenses and a new case afterward to avoid reinfection.
How can I lower my risk of contact lens infections?
Wash your hands before handling lenses, use only fresh disinfecting solution, replace lenses and your case on schedule, and never sleep, swim, or shower in them. Daily disposables carry the lowest risk.
