LASIK infections are rare—occurring in roughly 0.1% of cases—but when they do develop, catching the signs early is the difference between a quick course of treatment and a prolonged complication that threatens your visual outcome. Knowing what’s normal discomfort and what’s a genuine warning sign gives you the confidence to act decisively if something goes wrong.
This guide covers every symptom you should watch for, what causes post-LASIK infections, the critical timeline when risk is highest, and exactly what to do if you suspect a problem. Whether you had Femto LASIK, Contoura Vision, or SMILE Pro, understanding these signs could protect your vision.
Key Takeaways
- Increasing pain that worsens after the first 24 hours—rather than improving—is the single most important red flag for infection.
- White or yellow discharge, especially with a cloudy or hazy appearance to vision, warrants an urgent call to your surgeon.
- Most infections develop within the first week after surgery, making diligent hygiene and drop compliance critical during this window.
- Early detection and treatment almost always result in full visual recovery; delays can lead to scarring.
Normal Post-LASIK Symptoms vs. Infection Warning Signs
The first 24–48 hours after LASIK involve a predictable set of symptoms that are entirely normal: mild stinging or burning, watery eyes, light sensitivity, a gritty “foreign body” sensation, and slightly hazy vision. These should improve steadily each day. If you’re experiencing the typical early recovery pattern, our guide on what to expect after LASIK covers it in detail.
An infection, by contrast, follows a different trajectory. Instead of getting better, symptoms get worse—often after an initial period where things seemed fine. Pain intensifies rather than fading. Redness deepens rather than clearing. Vision that was improving suddenly deteriorates. This reversal pattern is the hallmark that separates normal healing from a developing problem.
The Key Signs of Eye Infection After LASIK
Increasing or Returning Pain
Some discomfort on the day of surgery is expected. But if pain is getting worse on day two, three, or beyond—or if pain returns after a pain-free period—that’s not normal healing. Post-LASIK infections typically produce a deep, aching pain that doesn’t respond well to lubricating drops. This differs from the mild grittiness of normal recovery, which should respond to preservative-free artificial tears.
Redness That Worsens or Doesn’t Fade
Mild redness in the first few days is typical—it’s a normal inflammatory response to the procedure. But redness that intensifies after the second day, spreads across more of the white of the eye, or appears concentrated in one area (especially near the cornea) is a concern. This is different from the subconjunctival haemorrhage (a bright red patch from a broken blood vessel), which looks alarming but is usually harmless.
Unusual Discharge
Watery tearing is normal post-LASIK. What’s not normal is thick, white, yellow, or greenish discharge collecting on the lash line—especially upon waking. If you notice crusty build-up that’s more coloured than clear, and it persists beyond the first day, report it to your surgeon.
Worsening or Sudden Blurred Vision
Vision after LASIK typically starts hazy and clears progressively. If your vision was improving and then suddenly becomes cloudy, foggy, or markedly worse—especially in one eye—this could indicate an infection affecting the corneal tissue. A localised white infiltrate on the cornea (visible as a white spot) is a particularly urgent sign that needs same-day evaluation.
Severe Light Sensitivity
Mild photophobia in the first day or two is expected. But intense sensitivity to light that makes it difficult to open your eyes indoors—especially if accompanied by pain—suggests inflammation that may have an infectious cause.
Swelling Beyond the First Day
Some eyelid swelling on the day of surgery is normal. Swelling that develops or worsens on day two or three—particularly if the eyelid is warm, tender, or puffy—may indicate a developing infection or severe inflammatory response.
What Causes Post-LASIK Infections?
Infections after LASIK are caused by bacteria, fungi, or, rarely, other microorganisms entering the eye through the surgical site. The corneal flap creates a potential entry point during the healing period. Common causes include contaminated eye drops or applicators, touching or rubbing the eyes with unwashed hands, exposure to contaminated water (pools, hot tubs, or even tap water splashed directly into the eyes), old or shared cosmetics applied too soon, and environmental contaminants like dust or airborne particles.
The healing cornea is temporarily more vulnerable because the flap interface hasn’t fully sealed and the surface epithelium is still regenerating. Flapless procedures like SMILE Pro have a smaller incision and may carry a marginally lower infection risk, but no laser eye surgery is completely immune.
When Is the Risk Highest?
The first seven days after LASIK represent the highest-risk window for infection. During this period, the corneal flap is still settling and the epithelial barrier hasn’t fully reformed. The flap healing process is most vulnerable in these early days, which is precisely why your surgeon prescribes antibiotic drops and asks you to follow a strict hygiene protocol.
Bacterial infections tend to appear within the first three to five days. Certain slower-growing organisms—like atypical mycobacteria or fungi—may not produce noticeable symptoms until one to four weeks post-surgery. This is why follow-up appointments at one day, one week, and one month are so important. If you experience new symptoms at any point during the first month, don’t dismiss them simply because “it’s been too long for an infection.”
Types of Infections After LASIK
Bacterial Keratitis
The most common type, usually caused by Staphylococcus or Streptococcus species. Presents with rapid-onset pain, redness, discharge, and often a visible white spot on the cornea. Responds well to aggressive antibiotic therapy when caught early.
Diffuse Lamellar Keratitis (DLK)
Sometimes called “Sands of Sahara” syndrome, DLK is technically an inflammatory reaction rather than a true infection, but it mimics infection symptoms—hazy vision, discomfort, and light sensitivity. It typically develops within the first few days and requires prompt steroid treatment to prevent it from progressing.
Fungal Keratitis
Less common but more challenging to treat. Fungal infections develop slowly, sometimes appearing weeks after surgery, and produce a more indolent pattern of worsening haze and discomfort. They’re more likely in tropical climates or after exposure to organic matter.
Atypical Mycobacterial Infection
Rare but noteworthy, these infections have a delayed onset (often two to six weeks post-surgery) and don’t respond to standard antibiotics. They require specialised laboratory cultures for diagnosis and prolonged targeted therapy.
What to Do If You Suspect an Infection
If you notice any combination of the warning signs described above—especially worsening pain, new discharge, or deteriorating vision—take these steps immediately:
Do not wait for your next scheduled follow-up. Call your surgeon’s office or emergency line right away. Continue using your prescribed antibiotic and anti-inflammatory drops exactly as directed—do not stop them unless instructed. Avoid touching, rubbing, or applying any unsterile substance to the eye. Wear your protective eye shields to prevent accidental contact. Note the specific symptoms, which eye is affected, and when they started—this helps your surgeon assess the situation quickly, even over the phone.
Most importantly, don’t minimise symptoms or convince yourself to “wait and see.” With post-LASIK infections, early intervention—often within hours—makes the difference between a full recovery and a complicated one. The infection responds far better to treatment before it has a chance to penetrate deeper into the corneal stroma.
How to Prevent Eye Infections After LASIK
Prevention is straightforward, and following these protocols dramatically reduces your already-low risk. Use your prescribed antibiotic drops on schedule for the full course—don’t skip doses or stop early because your eyes feel fine. Wash your hands thoroughly with soap before administering any eye drops. Avoid water in or near your eyes for at least two weeks—this means no swimming, no splashing faces at the sink, and careful showering technique.
Keep your hands away from your eyes at all times during the healing period. Avoid dusty, smoky, or polluted environments as much as possible in the first week. Do not apply eye makeup for at least seven to ten days, and use only fresh, unshared products when you resume. Attend every scheduled follow-up appointment—even if your eyes feel perfectly fine—so your surgeon can detect subclinical issues before they become symptomatic.
Conclusion
Eye infections after LASIK are uncommon, but recognising the signs early is essential for protecting your visual outcome. The key rule: normal recovery gets better each day; an infection gets worse. If you notice increasing pain, coloured discharge, worsening vision, or spreading redness after the first 24–48 hours, contact your surgeon immediately—don’t wait. Early treatment almost always results in complete recovery.
If you’re preparing for LASIK and want a team that takes post-operative care as seriously as the surgery itself, book a consultation at Visual Aids Centre. We provide round-the-clock access to your surgical team throughout the critical recovery window, because the best outcomes depend on what happens after you leave the operating room.
Frequently Asked Questions (FAQs)
How common are eye infections after LASIK?
Very rare—infection rates are approximately 0.1% or less. Strict sterile technique during surgery and compliance with post-operative antibiotic drops keep the risk extremely low.
What does an infected eye look like after LASIK?
Typically you’ll see intensifying redness, a white or yellowish spot on the cornea, thick coloured discharge on the lashes, and potentially swollen eyelids. The eye may also appear hazy or cloudy compared to the other eye.
Can I treat a post-LASIK infection at home?
No. If you suspect an infection, contact your surgeon immediately. Post-LASIK infections require professional evaluation and often aggressive prescription antibiotic therapy that over-the-counter drops cannot provide.
How quickly can a LASIK infection cause permanent damage?
Some bacterial infections can progress rapidly within 24–48 hours if untreated, potentially causing corneal scarring. This is why same-day evaluation is critical when warning signs appear.
Are flapless procedures like SMILE Pro less prone to infection?
SMILE Pro uses a smaller incision without creating a full flap, which may marginally reduce infection risk. However, all refractive surgeries carry some level of infection risk, and the same post-operative hygiene protocols apply regardless of procedure type.
