LASIK Myths vs. Facts: What the Evidence Actually Shows

LASIK has been performed on tens of millions of eyes worldwide over more than 25 years. Despite this track record, misconceptions persist — many rooted in outdated information, anecdotal stories, or simple misunderstanding of how the procedure works. This guide examines the most common myths and sets the record straight with current evidence.

Why myths about LASIK persist

LASIK is unusual in the medical world: it is an elective surgery performed on a sensory organ that people are understandably protective of. Fear is natural. But fear combined with misinformation leads to poor decision-making in both directions — some people avoid a procedure that would genuinely improve their lives, while others rush in without proper screening because they dismiss all concerns as myths.

The goal here is not to convince you to get LASIK. It is to replace bad information with good information so you can make a clear-eyed decision (no pun intended).

Myth 1: LASIK can make you go blind

The fact: LASIK has never been documented to cause complete blindness. Zero cases of total blindness attributable to LASIK appear in the peer-reviewed literature.

This is perhaps the most common and most paralyzing fear. It deserves a detailed answer.

Blindness, medically defined, means no light perception at all or visual acuity so poor that a person cannot function. LASIK operates on the cornea — the clear front surface of the eye. It does not touch the retina, optic nerve, or lens, which are the structures whose failure leads to blindness from conditions like glaucoma, macular degeneration, or retinal detachment.

Can LASIK cause complications that reduce visual quality? Yes. A small number of patients experience persistent dry eye, halos, glare, or reduced contrast sensitivity. In extremely rare cases (estimated at less than 0.1%), complications like ectasia (progressive corneal thinning) can cause meaningful visual impairment — but even these cases are typically managed with specialty contact lenses or corneal cross-linking, not permanent blindness. For a detailed breakdown of every documented risk, see our Risks guide.

The bottom line: total blindness from LASIK is not a realistic outcome. Impaired visual quality is a low-probability but real risk that proper screening dramatically reduces.

Myth 2: LASIK is painful

The fact: The procedure itself is essentially painless. Post-operative discomfort is real but temporary and manageable.

Before the laser begins, your surgeon applies anesthetic (numbing) eye drops that eliminate sensation on the corneal surface. Most patients report feeling pressure during the procedure — particularly during flap creation — but not pain. The laser ablation itself typically takes 30—60 seconds per eye, during which patients feel nothing on the eye surface.

After the numbing drops wear off (usually 30—60 minutes post-procedure), most patients experience a gritty, burning, or watery-eye sensation that lasts 4—6 hours. This is the most uncomfortable part of the entire LASIK experience. Surgeons provide lubricating drops and sometimes a mild sedative or pain reliever for this window. By the next morning, the vast majority of patients are comfortable.

Day-to-day soreness, aching, or sharp pain beyond the first 24 hours is uncommon and should be reported to your surgeon. For a detailed timeline of what to expect, see our Recovery Timeline.

Myth 3: LASIK results are temporary and your vision will go back

The fact: The corneal reshaping performed during LASIK is permanent. However, your eyes can still change for other reasons over time.

This myth confuses two separate things: the stability of the LASIK correction and the natural evolution of your eyes with age.

The tissue removed during LASIK does not grow back. The corneal reshaping is structural and lasting. Multiple studies with 10-, 15-, and even 20-year follow-up data confirm that the vast majority of LASIK corrections remain stable over decades.

What can change:

• Presbyopia (age-related near-vision loss) affects virtually everyone by their mid-40s, regardless of whether they have had LASIK. This is a change in the lens inside the eye, not the cornea, and LASIK does not prevent it. You will likely need reading glasses eventually.
• Residual myopic regression occurs in a small percentage of patients (roughly 2—5%), where a modest amount of nearsightedness returns over years. This is usually mild and can be addressed with an enhancement procedure if desired.
• Cataracts develop with aging and are unrelated to LASIK. When cataract surgery becomes necessary, the fact that you had LASIK requires updated lens power calculations, but it does not prevent successful cataract surgery.

The core correction lasts. The myth that LASIK “wears off” conflates the procedure’s durability with the normal aging of the eye.

Myth 4: Contact lenses are safer than LASIK

The fact: Long-term contact lens wear carries cumulative risks that are often underestimated, and the comparison is more nuanced than most people realize.

Contact lenses are so common that people forget they are medical devices sitting on a living tissue surface. The risks of long-term contact lens wear include:

• Microbial keratitis (corneal infection): estimated to affect roughly 1 in 500 contact lens wearers per year for daily wear and as high as 1 in 100 for extended/overnight wear. Over 30 years of use, the cumulative exposure is significant. Severe corneal infections can cause scarring and permanent vision loss.
• Giant papillary conjunctivitis: chronic allergic response to lens deposits, causing discomfort and inability to wear contacts.
• Corneal neovascularization: abnormal blood vessel growth from chronic oxygen deprivation under contact lenses.
• Corneal abrasions and ulcers: from poor lens hygiene, overwear, or lens defects.

LASIK, by contrast, is a one-time event with a defined and finite risk window. The serious complication rate is below 1%, and the most common complications (dry eye, visual disturbances) typically resolve within months.

This does not mean contacts are unsafe for everyone or that everyone should get LASIK. It means the framing of “contacts are safe, surgery is risky” ignores the accumulated risk of decades of contact lens wear. A more honest comparison acknowledges risk on both sides.

Myth 5: LASIK is only for young people

The fact: LASIK is FDA-approved for patients 18 and older, and many surgeons successfully treat patients well into their 50s and beyond, depending on their eye health.

The ideal LASIK candidate typically falls between ages 22 and 55, but age alone is not disqualifying. What matters more:

• Prescription stability: Your prescription should be stable for at least one year. This is why most surgeons prefer patients to be at least in their early to mid-20s, when prescriptions have typically stabilized.
• Corneal health: Adequate thickness and a normal topographic map matter more than age.
• Lens clarity: Patients with early cataracts may be better served by lens-based procedures. A thorough evaluation determines this.
• Presbyopia awareness: Patients over 40 need to understand that even with perfect distance LASIK, reading glasses will likely be needed. Monovision LASIK is one strategy to address this, but it involves trade-offs.

Patients in their 40s and 50s regularly have successful LASIK. The key is a surgeon who evaluates candidacy based on eye health, not just age. See our Candidacy guide for the full list of factors surgeons assess.

Myth 6: Cheap LASIK is just as good as expensive LASIK

The fact: Price alone does not determine quality, but consistently below-market pricing often signals meaningful differences in technology, surgeon experience, or what is included.

LASIK pricing varies for real reasons:

None of this means the most expensive surgeon is automatically the best. But a price of $799 per eye in a market where the average is $2,500 per eye should prompt you to ask what is different — and to get the answers in writing before you commit. Practices that heavily discount typically make up revenue through volume, which can mean less time per patient, less customization, and less comprehensive screening.

Myth 7: If you move your eye during LASIK, the laser will blind you

The fact: Modern excimer lasers have high-speed eye-tracking systems that follow your eye’s movements in real time and pause automatically if your eye moves too far.

This is one of the most common fears, and one of the most easily addressed. Current laser platforms track eye position at speeds ranging from 500 to over 1,000 times per second. If your eye moves beyond the tracking range, the laser stops firing within milliseconds. It resumes only when your eye returns to the correct position.

Additionally, during blade-free (all-laser) LASIK, a suction ring gently stabilizes the eye during flap creation, making significant movement physically difficult.

Surgeons who perform hundreds or thousands of procedures per year are also skilled at keeping patients calm and positioned correctly. Blinking is prevented by a small speculum that holds the eyelids open (it sounds uncomfortable but is generally well-tolerated with numbing drops).

The scenario of “the laser slips and damages my eye” is not how the technology works. The tracking and safety systems are specifically engineered to prevent this.

Myth 8: LASIK permanently weakens your eyes

The fact: LASIK removes a precise amount of corneal tissue, which does reduce corneal thickness, but a properly screened eye retains more than enough structural integrity.

This myth has a kernel of truth wrapped in exaggeration. LASIK does remove tissue from the cornea, and the cornea is thinner afterward. If too much tissue were removed, or if the cornea were too thin to begin with, the structural integrity could be compromised — a condition called ectasia, where the cornea progressively bulges forward.

Here is why this concern, while valid in theory, is addressed in practice:

• Pre-operative screening includes corneal thickness measurements (pachymetry) and topographic mapping to ensure adequate tissue remains after the procedure. Most surgeons require a minimum residual stromal bed thickness of 250—300 microns.
• Corneal tomography (such as Pentacam imaging) can detect subclinical patterns that suggest a predisposition to ectasia, allowing surgeons to screen out at-risk patients before any tissue is removed.
• The incidence of post-LASIK ectasia is estimated at roughly 0.04—0.6% depending on the study, and the vast majority of these cases involved patients who, by today’s screening standards, would not have been considered good candidates.

A properly screened, adequately thick cornea that undergoes a standard LASIK correction is not structurally compromised in a clinically meaningful way. The eye functions normally after healing, and there is no evidence of progressive weakening in well-selected patients over decades of follow-up.

Myth 9: Everyone is a candidate for LASIK

The fact: An estimated 15—25% of people who seek LASIK consultations are not good candidates, and responsible surgeons turn them away.

Reasons someone may not be a candidate include:

• Corneas that are too thin or irregularly shaped
• Unstable prescriptions
• Prescriptions outside the treatable range
• Dry eye disease that is severe or uncontrolled
• Autoimmune or connective tissue disorders that impair healing
• Pregnancy or nursing (due to temporary prescription fluctuations)
• Keratoconus or other corneal diseases
• Certain pupil size characteristics relative to the planned treatment zone

Being told you are not a candidate is not a failure. It is a sign that the surgeon is prioritizing your safety. Some patients who are not candidates for LASIK may be candidates for alternative procedures like PRK, ICL (implantable collamer lens), or refractive lens exchange. See our Candidacy guide for the complete list of screening criteria.

Myth 10: LASIK technology has not improved — it is the same old procedure

The fact: LASIK technology has advanced substantially over the past decade, and outcomes today are measurably better than outcomes from the early 2000s.

Key advancements include:

• Femtosecond laser flap creation replaced mechanical microkeratomes, improving flap uniformity and reducing flap-related complications.
• Wavefront-guided and topography-guided treatments customize the ablation pattern to each individual eye’s optical map, reducing higher-order aberrations and improving night vision outcomes.
• Improved eye-tracking systems now operate at 1,000+ Hz, making the laser more precise and responsive to eye movement.
• Better diagnostic tools (corneal tomography, epithelial thickness mapping, tear film analysis) allow surgeons to identify marginal candidates who would have been treated — and potentially had problems — in earlier eras.
• SMILE and other small-incision approaches offer alternatives for patients who may benefit from a flapless procedure.

If your impression of LASIK is based on stories from the late 1990s or early 2000s, it is worth updating your understanding. The procedure performed today is significantly more precise, more customizable, and safer than the procedure performed 20 years ago.

How to think about LASIK information you encounter online

A few practical guidelines:

1. Check the date. LASIK technology and screening have improved substantially. Information from before 2010 may describe complication rates and outcomes that no longer reflect current practice.
2. Consider the source. The FDA, the American Academy of Ophthalmology, and peer-reviewed journals are reliable starting points. Personal anecdotes — both glowing and terrifying — are real experiences but not necessarily representative.
3. Beware of absolutism. Claims that LASIK is “perfectly safe” or “always a mistake” are both wrong. The truth is statistical: it works very well for most properly screened candidates, with a small but real rate of complications.
4. Ask your surgeon directly. The best information about your specific situation comes from a surgeon who has examined your eyes with modern diagnostic equipment. No article, including this one, can replace that evaluation.

The bottom line

Most of the fears that keep people from seriously considering LASIK are based on outdated information, misunderstandings about the technology, or the natural anxiety of contemplating eye surgery. The evidence from 25+ years of data, millions of procedures, and rigorous FDA oversight tells a consistent story: LASIK is safe and effective for properly screened candidates, with a small but real risk of side effects that are usually temporary.

The myths that contain a grain of truth — LASIK does thin the cornea, some patients do experience dry eye, outcomes are not literally guaranteed — are best addressed through thorough screening, realistic expectations, and choosing a well-qualified surgeon.

For detailed information on what surgeons evaluate during candidacy screening, see our Candidacy guide. For a clinical breakdown of every documented risk and how modern practices mitigate them, see our Risks guide.