Is LASIK Safe? What the Evidence Actually Says

It’s the question almost everyone asks before laser eye surgery — often after reading an alarming headline. The honest, evidence-based answer is reassuring but not absolute: for properly screened candidates, LASIK is one of the safest and most satisfying elective procedures in modern medicine. It is not, however, risk-free — and understanding the real data, rather than the myths or the marketing, is the best way to make a confident decision. This article looks at what the studies actually show. It is for information only and is not a substitute for a personal evaluation.

The Big Picture: What Decades of Data Show

LASIK has been performed for over three decades, on tens of millions of eyes, making it one of the most studied elective procedures in the world. Across that evidence base:

• A large meta-analysis of global LASIK outcomes (Solomon et al., Ophthalmology, 2009) found patient satisfaction of about 95% — an exceptional figure for any surgery.
• The overall complication rate is consistently estimated at under 1%, and serious, vision-threatening complications are rarer still.
• The large majority of patients achieve 20/40 vision or better (the standard for driving without glasses in many places), and most achieve 20/20 or better.

In short, the data points firmly toward LASIK being safe and effective for suitable candidates.

What the FDA’s Own Studies Found (PROWL)

The most rigorous patient-experience research comes from the FDA’s PROWL studies (Patient-Reported Outcomes With LASIK; Eydelman et al., JAMA Ophthalmology, 2017). These were designed to capture how patients actually feel after surgery, not just chart measurements. A balanced reading of the results:

• Satisfaction was high — the large majority of participants were satisfied or very satisfied.
• New visual symptoms did occur. Roughly 30–40% of participants reported at least one new visual symptom (such as glare, halos, or dry eye) at three months.
• But severe impact was rare. Less than 1% reported visual symptoms severe enough to significantly interfere with their daily activities.
• Symptoms often improved over time, and importantly, pre-existing dry eye or visual symptoms before surgery predicted persistent symptoms afterward — which is exactly why screening matters.

The PROWL data is cited by both supporters and critics of LASIK. The fair conclusion: the procedure works very well for the vast majority, while a small minority experience bothersome symptoms — making candidate selection critical.

The Common, Usually Temporary Side Effects

Being honest about side effects is part of informed consent. The most common are:

Dry eyes. This is the most frequent side effect. In the FDA studies, about 30% of patients who had no dryness beforehand developed some new dry-eye symptoms in the first three months. Encouragingly, the majority of patients who did have dryness before surgery found it had resolved within three months. For most people, dry eye is temporary and manageable with drops.

Glare, halos, and starbursts at night. Some patients notice these in the early healing period, especially around lights at night. They typically diminish over weeks to months as the eyes heal.

These are usually part of the normal healing process rather than true complications, and they tend to settle.

The Rare but Serious Risks — and How They’re Prevented

Serious complications are uncommon, and modern screening exists specifically to prevent them:

• Corneal ectasia (progressive weakening and bulging of the cornea) is one of the most serious risks. It is rare, and proper pre-operative screening — corneal topography and thickness measurement — is designed to identify at-risk corneas and rule those patients out. Long-term studies of well-screened patients (e.g., Alió et al., 10-year follow-up, 2015) found stable results with no late-onset ectasia.
• Infection is very rare after LASIK and is treatable when caught early.
• Flap-related issues have become less common with modern bladeless (femtosecond) flap creation.

The key theme is consistent: most serious risks are minimised by careful candidate selection.

“Can You Go Blind From LASIK?”

This is the fear that drives most anxiety — and the evidence is clear. There is no documented case of LASIK being the primary cause of blindness. The serious complications that can occur affect quality of vision and are usually manageable; they are not the same as blindness. While no surgery can claim zero risk, the fear of going blind from LASIK is not supported by the data.

LASIK vs Contacts: An Honest Risk Comparison

It’s worth remembering that the alternative is not risk-free either. Daily contact lens wear carries a real, ongoing risk of serious eye infection that accumulates every year you wear them. LASIK is a one-time procedure, so its risk profile does not compound over time. Several analyses suggest that, over many years, the cumulative infection risk of contact lens wear can exceed the one-time risk of LASIK. The point isn’t that contacts are dangerous — it’s that “doing nothing” is also a choice with its own risk profile.

The Single Most Important Safety Factor

If there’s one thing the evidence makes clear, it’s this: LASIK’s safety depends overwhelmingly on proper candidate selection and surgical expertise. The procedure is very safe for the right candidate. A thorough pre-operative evaluation — corneal mapping, thickness measurement, tear-film assessment, and a stable prescription check — is what separates a safe outcome from an avoidable complication. A responsible clinic will tell you honestly if you are not a good candidate. (See: Am I a candidate for LASIK? →)

Safety at Netram Eye Foundation

Netram Eye Foundation is a super-speciality eye hospital in Greater Kailash II, South Delhi, led by Dr. Anchal Gupta. Our refractive process prioritises safety: comprehensive pre-operative diagnostics to confirm you are a suitable candidate, treatment on the German-engineered Schwind Amaris platform, and honest counselling — including telling you when LASIK isn’t right for you and recommending a safer alternative.

Book a refractive evaluation at our Greater Kailash centre to find out, safely, whether LASIK is right for you.

Frequently Asked Questions

Is LASIK safe? For properly screened candidates, LASIK is considered very safe, with patient satisfaction around 95% and an overall complication rate under 1%. It is not risk-free, and safety depends heavily on careful candidate selection and surgical expertise.

What is the LASIK complication rate? Serious complications occur in under 1% of cases, and vision-threatening complications are rarer still. More common are temporary side effects like dry eye and night-time glare, which usually resolve.

Can LASIK make you go blind? There is no documented case of LASIK being the primary cause of blindness. Serious complications affect quality of vision and are usually manageable, but no surgery is entirely without risk.

What does the FDA PROWL study say about LASIK? The FDA’s PROWL studies found high patient satisfaction overall, with some patients developing new visual symptoms (glare, halos, dry eye) at three months — but fewer than 1% reported symptoms severe enough to significantly affect daily activities.

How long do LASIK side effects last? Most side effects, such as dry eye and glare, are temporary and improve over weeks to a few months as the eyes heal. A minority of patients experience longer-lasting symptoms, which is why pre-surgery screening is important.

Is LASIK safer than wearing contact lenses? LASIK is a one-time procedure, so its risk does not compound over time, whereas contact lens wear carries an ongoing, yearly risk of infection. Over many years, the cumulative risk of contacts can exceed the one-time risk of LASIK.

Who should not have LASIK? People with thin or irregular corneas, unstable prescriptions, certain corneal conditions like keratoconus, severe dry eye, or who are pregnant may not be suitable. A full evaluation determines candidacy.

References

1. Solomon KD, et al. LASIK world literature review: quality of life and patient satisfaction. Ophthalmology. 2009.
2. Eydelman M, et al. Symptoms and satisfaction of patients in the Patient-Reported Outcomes With LASIK (PROWL) studies. JAMA Ophthalmol. 2017;135:13–22.
3. US Food and Drug Administration. LASIK Quality of Life Collaboration Project (PROWL-1 and PROWL-2). FDA.gov.
4. Alió JL, et al. Ten-year follow-up of laser in situ keratomileusis for myopia. Am J Ophthalmol. 2015. (long-term stability; no late ectasia in screened patients)
5. Mathews PM, et al. Risk of corneal infection: contact lens wear versus LASIK (cumulative risk comparison).

Medically reviewed by Dr Anchal Gupta, Senior Eye Surgeon, Netram Eye Foundation. This article is for general information and is not a substitute for a personalised consultation with a qualified ophthalmologist. Statistics cited describe published study results and do not represent outcomes at any specific clinic.