If you’ve been thinking about getting rid of your glasses or contacts, LASIK has probably come up as an option. And one of the first things most people want to know is whether it’s actually safe. That’s a fair question, and the answer deserves more than a simple yes or no.
LASIK is a laser procedure that reshapes the cornea to correct refractive errors like nearsightedness, farsightedness, and astigmatism. It has a strong overall safety record, with millions of procedures performed worldwide each year. But it is still surgery, and like any surgical procedure, it carries real risks that are worth understanding before you decide. Good candidacy screening and informed consent aren’t just formalities. According to the Cleveland Clinic , they’re central to keeping outcomes as safe and predictable as possible.
The data on LASIK outcomes is, by most measures, reassuring. Large studies report that the vast majority of appropriately selected patients achieve 20/40 vision or better after the procedure, and many reach 20/20. Patient satisfaction rates in major clinical series have consistently been high. Modern laser technology and detailed corneal mapping have also improved precision considerably compared to earlier generations of the procedure.
That said, serious or vision-threatening complications, while uncommon, are not zero. For well-screened patients, overall complication rates in large series are generally reported at under 1 percent according to the Cleveland Clinic . Some experts and former patients, however, have raised concerns that real-world complication rates and long-term issues may be higher than those figures suggest, and there are ongoing calls for greater transparency in how outcomes are tracked and reported. The procedure’s safety record is strong, but it’s not perfect, and knowing both sides of that picture is part of making an informed decision.
This comparison comes up often, and it’s a reasonable one to make. Long-term contact lens wear carries its own risks, including corneal infections, scarring, and chronic inflammation , particularly with extended-wear lenses or inconsistent hygiene habits. Some estimates suggest the annualized risk of a serious infection from contact lens wear may be comparable to or exceed the risk of a sight-threatening LASIK complication over a lifetime for properly screened patients.
But “safer” isn’t a universal answer here. It depends on your habits with contacts, your prescription, your eye health, and your personal comfort with surgical versus non-surgical risk. This comparison is best treated as useful context for a conversation with your eye doctor, not a reason to move forward or hold back on its own.
Most people who have LASIK experience some degree of short-term side effects in the days and weeks after surgery. The most common include dry eyes, light sensitivity, halos or glare around lights at night, mild blurriness, and some discomfort during the initial healing period. These typically ease as the eye heals.
Dry eye symptoms are especially common and can persist for several months in a meaningful share of patients. For most people, this improves over the course of 6 to 12 months, but for some it becomes a longer-term issue.
More serious risks include infection, inflammation, problems with the corneal flap, corneal ectasia (a progressive thinning and steepening of the cornea), residual refractive error that requires glasses or a follow-up procedure, and in rare cases, a loss of best-corrected vision. These complications are uncommon, but they can have a real impact on daily life when they do occur. A small number of patients experience persistent visual symptoms or chronic pain that significantly affect their quality of life, and these cases are part of why transparency in outcome data matters. Understanding both the probability and the potential severity of these risks is essential before proceeding.
Long-term follow-up studies show that many patients maintain stable vision and high satisfaction over 5 to 10 or more years after surgery. For a large portion of appropriately selected people, the procedure holds up well over time.
That said, LASIK does not protect against age-related changes. You may still develop presbyopia (the need for reading glasses as you age) and will still be susceptible to cataracts. Some clinicians have raised concerns about late-onset ectasia, chronic dry eye, or gradual changes in vision quality in certain patient groups, and the limits of available long-term data mean some questions remain open. According to EyeWiki , ongoing research continues to refine our understanding of who fares best over the long term.
Regulatory bodies have also taken note. The FDA has undertaken quality-of-life projects specifically aimed at better understanding persistent symptoms after LASIK, which reflects both the procedure’s widespread use and a genuine commitment to improving how outcomes are tracked.
A thorough pre-operative evaluation is one of the most important safety measures in the process. Before surgery, providers perform comprehensive eye exams that measure corneal thickness and shape, map the cornea for irregularities, assess tear film quality, and evaluate pupil size. These measurements help determine whether your eyes are suitable for the procedure and guide the treatment plan.
Prescription stability and age also factor into candidacy decisions. Most LASIK surgeons want to see a stable prescription for at least one to two years before operating. During and after surgery, sterile technique, protective eye shields, and prescribed anti-inflammatory and antibiotic drops help reduce the risk of infection and inflammation. Modern laser systems use detailed corneal maps and real-time tracking to improve precision throughout the procedure.
If a small residual error remains after healing, enhancement procedures are sometimes an option. A good surgeon will set realistic expectations from the start and have an honest conversation about what the procedure can and cannot achieve in your specific case.
Typical good candidates are adults with a stable prescription, healthy corneas of adequate thickness, no active eye disease, and realistic expectations about outcomes. Common disqualifying factors include keratoconus (a condition where the cornea progressively thins and bulges), severe dry eye, very thin corneas, extremely high refractive errors, certain autoimmune conditions, poorly controlled diabetes, and pregnancy. Corneal disease or irregular corneal shape that doesn’t meet specific criteria is another significant reason a surgeon may advise against the procedure, according to the Cleveland Clinic and Mayo Clinic .
Being told you are not a candidate is a safety decision, not a missed opportunity. The screening process exists to protect your vision, and a surgeon who turns you away is doing exactly what they should be.
Modern LASIK is FDA-approved to treat many forms of corneal astigmatism within defined diopter ranges, and outcomes data within those limits are generally strong. The procedure works by reshaping an irregularly curved cornea into a more uniform shape, which reduces or eliminates the blurring and distortion associated with astigmatism.
Not all astigmatism is the same, though. Lenticular astigmatism, which originates in the lens rather than the cornea, cannot be corrected by reshaping the corneal surface. Certain corneal patterns are also not well-suited to LASIK, which is why detailed corneal mapping is especially important for patients with astigmatism. Higher levels of astigmatism carry a somewhat greater risk of residual blur or nighttime vision symptoms, and surgeons plan accordingly. The specifics of your corneal measurements and the type and degree of your astigmatism will shape what outcomes are realistically achievable for you.
For patients who are appropriately selected, those with astigmatism can achieve satisfaction and vision outcomes comparable to patients with simple myopia or hyperopia. The results depend heavily on the amount and pattern of astigmatism, corneal thickness, and whether any other eye conditions are present. If you have astigmatism and are exploring LASIK, ask about your specific corneal measurements and what the expected outcome range is for someone with your profile. “Can I have LASIK?” is only part of the question. “What can I realistically expect?” matters just as much.
Diabetes has traditionally been considered a relative contraindication for LASIK, primarily because it can affect corneal healing and increase susceptibility to infection. Fluctuating blood sugar can also cause temporary shifts in vision that make it difficult to determine a stable prescription before surgery.
That said, current evidence suggests LASIK may be reasonably safe for carefully selected patients with well-controlled diabetes, stable blood glucose, and no significant diabetic eye disease. Outcomes can be favorable in this group when screening is rigorous. Providers evaluating diabetic patients will assess the duration and control of the disease, whether diabetic retinopathy or macular edema is present, and overall systemic health. These criteria are more stringent than for non-diabetic patients, and some individuals with diabetes will still be advised that LASIK is not appropriate for them. In those cases, glasses or contacts remain safe and effective options.
If you have diabetes and want to explore LASIK, a few specific questions are worth bringing to your consultation. Ask what level of blood sugar control your surgeon requires before they would consider you a candidate, and whether there is any evidence of diabetic changes in your retina that might affect eligibility or outcomes. It’s also reasonable to ask about healing timelines, infection risk, and whether your surgeon has specific experience performing LASIK on patients with diabetes. Given how much systemic control matters, coordinating with your primary care physician or endocrinologist to optimize your metabolic health before any surgical evaluation is also a smart step.
There are a number of situations where LASIK is typically avoided. These include thin or irregular corneas, progressive ectatic disease such as keratoconus, severe dry eye, very high refractive errors outside treatable ranges, active eye disease, poorly controlled systemic conditions, pregnancy, and certain occupations involving a high risk of eye trauma. As the Mayo Clinic and Cleveland Clinic both note, these are not arbitrary exclusions. They reflect real risks that make other options safer for certain patients.
Alternatives exist and are worth understanding. PRK (photorefractive keratectomy) reshapes the corneal surface without creating a flap, which makes it suitable for some patients with thinner corneas. Implantable Collamer Lenses (ICL) are a surgical option for people with high prescriptions who aren’t suitable for surface-based laser procedures. Each of these has its own safety profile and candidacy criteria, and none is universally better or worse than LASIK. The right choice depends on your individual anatomy and visual needs.
Preparing for a LASIK consultation thoughtfully can help you get the most out of it. Consider writing down your current visual symptoms, how you use your vision day-to-day (night driving, extended screen time, sports), any medications you take, and your full medical history. This context helps your surgeon assess candidacy more accurately.
During the consultation, ask for a clear explanation of your corneal measurements, the predicted outcome range for someone with your profile, and what your specific risks are. A thorough provider will welcome these questions. If you feel rushed, pressured, or uncertain about any of the information you receive, the FDA advises that seeking a second opinion is entirely appropriate and worth doing before committing to surgery.
It’s also worth remembering that choosing not to have LASIK after a full evaluation is a completely valid outcome. There is no right answer that applies to everyone, and a decision to stay with glasses or contacts is just as legitimate as choosing to proceed.
LASIK has a strong overall safety record and high patient satisfaction rates among well-screened, appropriately selected patients. For many people, it delivers lasting vision improvement with a low risk of serious complications. But it is not risk-free, and the word “safe” means something different to you, your eyes, your health, and your habits.
Individual outcomes depend on a combination of factors, including corneal anatomy, systemic health, the quality of the preoperative evaluation, and the care taken throughout the process. This article is meant to give you a foundation for that conversation with your eye care provider, not to replace it. The more informed you are going in, the better positioned you’ll be to ask the right questions and make a decision that’s genuinely right for you.
This article has been reviewed for accuracy by the ophthalmology team at St. Luke’s Cataract & Laser Institute in Florida. For personalized advice about your eye health and cataract risk, please consult with a qualified eye care professional.
