LASIK is one of the most successful elective surgeries available. More than 90 percent of patients achieve 20/20 vision or better, and 99 percent reach at least 20/40, which is the threshold for driving without glasses in most states. Patient satisfaction rates consistently land between 95 and 99 percent across clinical studies. Those are strong numbers, but they don’t tell the whole story. The experience varies depending on your prescription, your eye anatomy, and how you define “success.”
What the Vision Numbers Actually Mean
The headline stat, over 90 percent achieving 20/20, comes from a large analysis published in the Journal of Cataract & Refractive Surgery. That means the vast majority of people walk away seeing as well without glasses as they previously did with them. The 99 percent figure for 20/40 vision is equally important: it means nearly everyone ends up with functional distance vision, even if it’s not perfectly sharp.
These results apply to people who were good candidates in the first place. If your prescription is mild to moderate (roughly up to -6.00 diopters of nearsightedness), outcomes tend to be excellent. Higher prescriptions can still be corrected, but the chances of needing a touch-up procedure go up, and the final result may not be quite as crisp.
How Patients Feel About Their Results
Clinical measurements and real-world happiness don’t always match, so satisfaction data matters. Across studies, 95 to 99 percent of LASIK patients report being satisfied. That’s an unusually high number for any medical procedure.
A review of 464 patient-written reviews on the social platform RealSelf found slightly lower but still favorable numbers: about 78 percent described LASIK as “worth it,” roughly 13 percent said “not worth it,” and 9 percent were unsure. The gap between clinical satisfaction surveys and open online reviews is worth noting. People who are unhappy are more likely to seek out review platforms, which pulls the numbers down. Still, even in that self-selected group, the large majority were glad they did it.
Side Effects Most People Experience
Nearly everyone has dry eyes and some visual disturbances in the weeks after surgery. These typically fade as the cornea heals. The more important question is how many people deal with lasting side effects.
Dry eye is the most common ongoing complaint. One study of 190 eyes found that 20 percent still had dry eye symptoms six months after surgery. Women and people with higher prescriptions face greater risk. For most, the dryness is manageable with artificial tears, but for some it becomes a persistent nuisance.
The FDA’s LASIK Quality of Life Collaboration Project (known as the PROWL studies) tracked visual symptoms carefully. Up to 46 percent of participants who had no visual symptoms before surgery reported at least one new symptom at three months. Halos were the most common: up to 40 percent of people who never had halos before developed them after LASIK. Starbursts, glare, and ghosting also appeared in smaller numbers.
Before that alarms you, context matters. Less than 1 percent of participants in the PROWL studies said any single visual symptom caused “a lot of difficulty” with or inability to do their usual activities. In other words, many people notice halos around lights at night, but very few find them disruptive enough to affect daily life.
How Long Results Last
LASIK reshapes your cornea permanently, but your eyes can still change over time. Most patients maintain their corrected vision for 10 to 20 years. The most common reason results shift is natural age-related change, particularly presbyopia (the need for reading glasses that hits most people in their 40s). LASIK corrects distance vision; it doesn’t prevent the gradual stiffening of the lens inside your eye that makes close-up reading harder with age.
Some people also experience mild regression, where a small amount of their original prescription creeps back. This is more likely in people who had very high prescriptions corrected. When regression happens, it’s usually modest and slow.
Retreatment Rates
About 10.5 percent of LASIK patients undergo an enhancement procedure, sometimes called a touch-up, with 85 percent of those enhancements happening within the first year. An enhancement uses the same basic technique to fine-tune the correction. It doesn’t mean the first procedure failed. It means the eye healed in a way that left a small residual error worth correcting.
Whether you need an enhancement depends partly on the size of your original prescription and partly on individual healing. Many surgeons include one enhancement in their quoted price, so it’s worth asking about this upfront.
Recovery Timeline
Most people notice dramatically improved vision within hours of surgery. By the next day, many can drive and work comfortably. But the full picture takes longer to develop. Vision can fluctuate for weeks as the cornea stabilizes, and it takes three to six months for your eyes to reach their final result. During that window, you might notice your vision is sharper some days than others, or that dry eye symptoms come and go. This is normal and doesn’t predict your long-term outcome.
Who Gets the Best Results
Your starting point matters more than anything. The best outcomes tend to happen in people with mild to moderate nearsightedness, healthy corneas that are thick enough to safely reshape, stable prescriptions that haven’t changed in at least a year or two, and realistic expectations about what the surgery will and won’t do. People with very high prescriptions, thin corneas, large pupils, or autoimmune conditions that affect healing are either poor candidates or face higher odds of side effects.
A thorough pre-surgical screening catches most of these issues. The evaluation itself, including corneal thickness mapping and tear film testing, is one of the most important factors in whether your outcome will match the headline success rates. Surgeons who turn away borderline candidates tend to produce better overall results, so being told you’re not a good fit is actually the screening process working as it should.