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LASIK Risks & Side Effects
LASIK Safety Information · Dallas–Fort Worth
LASIK Risks & Side Effects:
A Complete, Honest Guide
LASIK has a 30-year, peer-reviewed safety record with millions of procedures performed globally. Understanding what’s common, what’s uncommon, and what’s genuinely rare helps you make an informed decision. This guide presents that data honestly.
Note from Tylock Nasser Vision: We provide this information because informed patients make better decisions and have better outcomes. The data here reflects peer-reviewed clinical literature. Outcomes at Tylock Nasser Vision are discussed in detail at your free consultation.
The Safety Picture
LASIK outcomes data: 30 years of evidence
LASIK is one of the most studied elective procedures in medicine. These figures are drawn from peer-reviewed studies and FDA summaries — not marketing claims.
95%+
of patients achieve 20/20 vision or better
96%
of LASIK patients report satisfaction with their results
<1%
rate of serious complications requiring further intervention
<0.01%
rate of significant permanent vision loss from LASIK
Sources: American Academy of Ophthalmology, FDA LASIK Patient Checklist, peer-reviewed clinical outcome studies. Individual results vary.
Side Effects & Risks by Frequency
What to expect, what to watch for, what’s rare
Most LASIK “side effects” are temporary healing responses, not complications. Understanding the distinction — and the frequency of each — is essential to calibrating your expectations correctly.
Common (affects 20–50% of patients, typically temporary)
Uncommon (affects 1–10% of patients, usually resolves)
Rare (<1% — documented risk requiring discussion)
Common — Expected during healing (typically resolve in 3–6 months)
Dry eye symptoms
Common · 20–40%LASIK transiently reduces the sensitivity of corneal nerves, which slightly diminishes the blink reflex and decreases tear production. This causes temporary dry eye — burning, grittiness, fluctuating vision, and light sensitivity. Symptoms typically peak in the first month and resolve within 3–6 months for most patients.
Management: Preservative-free artificial tears are highly effective. DFW’s dry climate amplifies this — budget for frequent lubricating drops in the first 4–6 weeks. Patients with pre-existing dry eye are evaluated carefully at consultation.
Halos, starbursts & glare at night
Common · 15–40%In the first 1–3 months, many patients notice halos around lights, starbursts from oncoming headlights, or increased nighttime glare. These occur as the cornea heals and are more noticeable when the pupil dilates in low light. For most patients, these symptoms diminish substantially by 3 months.
Contoura Vision topography-guided LASIK at Tylock Nasser Vision is associated with significantly better nighttime visual quality than standard LASIK because it treats unique corneal irregularities rather than just the prescription.
Visual fluctuation
Common · first 2–4 weeksVision that sharpens in the morning and is slightly blurrier in the evening — or varies across different days — is a normal part of corneal healing. The epithelium (surface layer) regenerates over 4–6 weeks, creating minor variation in optical clarity during this period.
This is not a sign of a problem. Most patients notice it less with each passing week.
Uncommon — Affects a minority of patients, usually manageable
Undercorrection or overcorrection
Uncommon · 2–10%In some cases, the laser correction doesn’t fully reach the target prescription. Mild undercorrection is more common than overcorrection and may still leave you with significantly better vision than before. If residual prescription warrants it, a LASIK enhancement (touch-up) can be performed after healing stabilizes — typically after 3 months.
Regression (prescription returning over years)
Uncommon · long-termA small percentage of patients experience some return of myopia over several years. This is more common with higher prescriptions. It is distinct from presbyopia (age-related reading vision changes), which affects everyone. Minor regression may be addressed with a LASIK enhancement if corneal thickness permits.
Persistent dry eye beyond 6 months
Uncommon · 1–5%A small number of patients, particularly those with pre-existing dry eye tendency, experience dry eye symptoms that extend beyond 6 months. Treatment options include prescription eye drops (cyclosporine), punctal plugs, and in-office therapies. This is one reason careful candidacy screening for dry eye history is essential before LASIK.
Rare — Documented risks that warrant honest discussion (<1%)
Flap complications
Rare · <0.5%The corneal flap created during LASIK can, rarely, become displaced, develop wrinkles (striae), or partially detach. Modern bladeless femtosecond laser flap creation — as used at Tylock Nasser Vision — has dramatically reduced flap complication rates compared to older microkeratome blade methods. Most flap issues, if detected early at post-op visits, are addressable.
This is a primary reason post-operative follow-up visits are required and why eye rubbing must be avoided for at least one month.
Diffuse lamellar keratitis (DLK)
Rare · <0.5%An inflammatory response that can occur beneath the LASIK flap in the days following surgery. Also called “sands of the Sahara,” DLK presents as diffuse inflammation rather than a localized infection. It is detected at post-operative visits and treated with increased steroid drops. When caught early, it resolves without vision impact.
Infection (infectious keratitis)
Very Rare · <0.02%Bacterial or other microbial infection beneath or on the cornea after LASIK is extremely rare when antibiotic drops are used as prescribed. Risk is substantially reduced by the bladeless procedure, sterile technique, and adherence to post-op drop protocols. Infection risk is one reason swimming pools and open water are restricted for 2–4 weeks post-procedure.
Ectasia (corneal weakening)
Rare · <0.2% — preventableEctasia is a progressive corneal thinning and steepening that can occur if too much tissue is removed or if underlying keratoconus is present but not detected pre-operatively. Rigorous pre-operative corneal topography mapping — including Contoura Vision’s 22,000-point map — is the primary defense against this risk. Patients with pre-existing corneal irregularities suggestive of keratoconus are disqualified from LASIK candidacy.
Disqualifying Conditions
Conditions that disqualify LASIK candidacy — and what to do instead
Careful pre-operative screening eliminates most serious LASIK risk. The following conditions are contraindications — meaning LASIK should not be performed. Alternative procedures may still be available.
Keratoconus or corneal ectasia
A progressive weakening of the cornea that makes LASIK contraindicated due to ectasia risk. Identified by corneal topography at the consultation.
Alternative: Keratoconus cross-linking · EVO ICL in some cases
Insufficient corneal thickness
LASIK requires removing corneal tissue. If residual thickness after treatment would fall below safe thresholds, candidacy is declined to prevent structural weakening.
Alternative: EVO ICL (no tissue removed) · PRK in some cases
Unstable prescription (<12 months stable)
LASIK targets a fixed prescription. If your prescription is still changing, the result may not be optimal or lasting. A stable prescription for at least 12 months is required.
Next step: Recheck prescription in 6–12 months
Severe dry eye disease
Pre-existing severe dry eye significantly increases the risk of symptomatic dry eye after LASIK. Moderate dry eye is evaluated case-by-case; severe dry eye is a contraindication.
Alternative: EVO ICL is generally safe for dry eye patients
Certain autoimmune or systemic conditions
Conditions affecting wound healing (lupus, rheumatoid arthritis, Sjogren’s syndrome, uncontrolled diabetes) can impair post-LASIK healing and are evaluated individually.
Alternative: Discuss at consultation with medical history review
Pregnant or nursing
Pregnancy and nursing affect hormonal balance, fluid retention, and corneal curvature — all of which affect prescription stability and surgical measurements. LASIK is postponed until 3+ months post-nursing.
Next step: Schedule consultation after nursing is complete
Risk Minimization
How Tylock Nasser Vision approaches LASIK safety
Comprehensive pre-operative screening
Every patient undergoes corneal topography, thickness measurement, pupil sizing, dry eye assessment, and full prescription evaluation before any procedure decision is made. Patients who don’t meet strict candidacy criteria are not offered LASIK — even if they want it.
Contoura Vision topography-guided treatment
Mapping 22,000 corneal elevation points before surgery identifies subtle irregularities that standard LASIK misses. This data directly reduces undercorrection, overcorrection, and nighttime visual symptoms by creating a truly individualized treatment plan.
Bladeless femtosecond flap creation
The Alcon WaveLight FS200 creates corneal flaps with greater consistency and precision than older microkeratome blade systems. This directly reduces the risk of irregular flap thickness — the leading contributor to flap-related complications.
1,050 Hz eye tracking
The WaveLight EX500 tracks your eye 1,050 times per second during laser treatment and pauses the laser if your eye moves outside the safe treatment zone. This prevents treatment decentration — placing the correction precisely where it needs to be even if the eye moves involuntarily.
Mandatory post-op follow-up protocol
Complications like DLK and flap displacement are almost always detectable — and treatable — at the next-morning follow-up visit. Our mandatory follow-up schedule (next morning, 1 week, 1 month, 3 months) exists specifically to identify and address issues before they become serious.
40+ years combined surgical experience
Experienced surgeons recognize and manage intraoperative variations that less-experienced teams may not. Tylock Nasser Vision’s 100,000+ procedure track record provides a foundation of pattern recognition and clinical judgment that no technology alone can replicate.
Risk Questions
What patients ask about LASIK safety
Can LASIK cause blindness?
Loss of best-corrected visual acuity — meaning vision that cannot be corrected back to its pre-LASIK level even with glasses — is exceedingly rare and estimated at less than 0.01% in properly screened candidates with experienced surgeons. There are no documented cases of total blindness caused by LASIK in the modern era of bladeless laser procedures. This said, like all surgeries, LASIK carries some risk, which is why candidacy screening and choosing an experienced, high-volume practice matters significantly.
What happens if I move my eye during the procedure?
The WaveLight EX500 excimer laser tracks your eye position 1,050 times per second. If your eye moves outside the pre-defined treatment zone, the laser automatically pauses — it does not continue treating a decentered position. This active tracking effectively eliminates the practical risk of eye movement during treatment. The brief fixation target you’re asked to maintain during the procedure helps center tracking, but the system’s response is automatic and does not depend on your ability to hold perfectly still.
I’ve read about LASIK-associated depression and chronic pain. Should I be concerned?
A small body of case reports and patient advocacy literature has raised concerns about persistent dry eye causing significant quality-of-life impacts in a small subset of LASIK patients. The clinical frequency of severe, persistent dry eye causing significant functional impairment is estimated at under 1% of LASIK procedures. Pre-operative dry eye assessment — a standard part of our consultation — is the primary way to identify patients at higher risk. Patients with significant pre-existing dry eye are either directed toward EVO ICL or, in cases of severe dry eye, advised against any corneal refractive procedure.
Is LASIK safer now than it was 10 or 15 years ago?
Yes, meaningfully so. Three advances account for most of the improvement: the elimination of microkeratome blades in favor of femtosecond lasers for flap creation (reducing flap complications), the development of topography-guided LASIK (reducing undercorrection and improving night vision quality), and more refined candidacy screening tools that better detect contraindications like early keratoconus before surgery. The active tracking speed of modern excimer lasers has also improved significantly over systems used a decade ago.
Make your decision with complete information
A free consultation at Tylock Nasser Vision includes a thorough review of your personal candidacy risk factors, procedure options, and expected outcomes. No pressure. No obligation.
