Laser eye surgery is one of the safest elective procedures available, with a 96% patient satisfaction rate and over 99% of patients achieving functional vision without glasses afterward. Serious complications are rare, occurring in fewer than 1 in 2,000 cases. That said, it’s not risk-free, and some temporary side effects are common enough that you should know what to expect.
What the Numbers Say About Outcomes
More than 90% of patients achieve 20/20 vision or better after LASIK, and 99% reach at least 20/40, which is the threshold for driving without corrective lenses in most states. The 96% satisfaction rate, published in the Journal of Cataract & Refractive Surgery, is higher than for virtually any other elective procedure. Most patients can expect their corrected vision to remain stable for 10 to 20 years.
An FDA-sponsored study (known as PROWL) looked specifically at what patients reported after surgery. While 43% to 46% of participants noticed new visual symptoms like glare or halos at the three-month mark, very few said those symptoms caused meaningful limitations in daily life. Many participants had visual complaints before surgery too, and the overall prevalence of symptoms actually decreased after the procedure.
Temporary Side Effects Are Common
Dry eye is the most frequent side effect. About half of patients experience it in the first week, and roughly 20% to 40% still notice it at six months. For most people, tear function and comfort return to pre-surgery levels within about a month. Chronic dry eye lasting more than a year affects fewer than 1% of patients, closer to 0.8% in published studies.
Glare, halos around lights, and starbursts are also common in the weeks and months after surgery. These tend to be most noticeable when driving at night. The stabilization period can last three to six months, during which these visual symptoms gradually fade. Newer topography-guided lasers have actually flipped the script on night vision problems. A prospective study found that patients treated with this technology reported statistically significant improvements in night vision, glare, halos, and starbursts compared to before surgery.
Serious Complications Are Rare
The complication that eye surgeons worry about most is corneal ectasia, a progressive weakening and bulging of the cornea. The incidence is estimated at less than 1 in 2,000 uncomplicated cases, and it’s strongly linked to identifiable risk factors: thin corneas, very high prescriptions, and cases where too much tissue is removed. Proper screening catches most of these risks before surgery ever happens.
Flap-related complications are another concern specific to LASIK, which involves creating a thin flap in the cornea. These are uncommon with modern femtosecond lasers but can include flaps that are thicker than intended or, very rarely, flaps that shift or wrinkle during healing. Contact sports pose a risk of flap dislocation even years later, which is why surgeons advise against LASIK for people who box, play football, or do martial arts regularly.
How the Three Main Procedures Compare
LASIK is the most well-known option, but PRK and SMILE offer different safety tradeoffs depending on your eyes.
- LASIK delivers the fastest recovery and sharpest early results, but requires adequate corneal thickness and carries a small risk of flap complications. Temporary dry eye is more common than with SMILE.
- PRK skips the flap entirely, making it the go-to choice for people with thinner corneas or surface irregularities. Recovery takes longer and there’s a slightly higher chance of temporary haze during healing, though modern techniques have made this rare.
- SMILE uses a very small incision instead of a flap, which means faster surface healing and a lower risk of dry eye compared to LASIK. It’s the newest of the three and a good option for people concerned about dry eye or corneal strength.
Who Should Not Get Laser Eye Surgery
Not everyone is a good candidate, and a thorough screening is what separates a safe outcome from a risky one. The FDA lists several clear disqualifiers. Your prescription needs to have been stable for at least a year. Autoimmune conditions like lupus or rheumatoid arthritis, immunodeficiency conditions like HIV, and diabetes can all interfere with healing. Certain medications, including steroids and retinoic acid, pose the same problem. You also need to be at least 18.
Your surgeon should screen for thin corneas, large pupils, existing dry eye, keratoconus (a condition where the cornea is abnormally shaped), glaucoma, and any history of eye herpes, eye inflammation, or previous eye surgeries. Each of these factors can increase the chance of complications or poor results. A reputable surgeon will turn away candidates who aren’t a good fit, and that screening process is one of the most important safety mechanisms in the entire procedure.
What Recovery Actually Looks Like
The surgery itself takes about 15 minutes for both eyes. You’ll need someone to drive you home because your vision will be blurry and you may have been given a mild sedative. Plan on taking a few days off work while the initial blurriness, light sensitivity, and watering subside.
You can return to light, non-contact exercise within one to three days. Contact sports are off limits for at least four weeks, and you should stay out of swimming pools and hot tubs for one to two months to avoid infection. Night driving may feel uncomfortable for several weeks or even a few months as glare and halos settle down. Most people notice a dramatic improvement in vision within the first 24 to 48 hours, but full stabilization of your prescription can take three to six months.
How Modern Technology Has Reduced Risk
Laser eye surgery in 2024 is meaningfully safer than it was a decade ago. Topography-guided lasers map the unique contours of your cornea and customize the treatment to your eye’s specific shape, rather than applying a standard correction. This precision has reduced the incidence of post-surgical glare and halos to the point where patients in clinical studies actually reported better night vision after surgery than before it.
Femtosecond lasers, which create the corneal flap in LASIK, have replaced the older blade-based method and produce more consistent, predictable flaps. Better diagnostic imaging catches thin corneas, early keratoconus, and other risk factors that would have been missed in earlier eras. The combination of better screening, better lasers, and better surgical planning is the reason complication rates have dropped steadily over the past two decades.