What Does “LASIK Failure” Actually Mean?
There is no single definition, and that is why you see different numbers online. Doctors usually think of three levels:
Common Problems After LASIK
| Problem | How common | What to know |
|---|---|---|
| Dry eyes | Common | Usually temporary and treated with lubricating drops. See why dry eyes happen after LASIK. |
| Glare, halos, starbursts | Common early on | Mostly noticed at night. Tends to settle as the eye heals. |
| Under- or over-correction | Uncommon | Vision is not fully corrected. An enhancement procedure may help if the cornea is thick enough. |
| Regression | Uncommon | The prescription drifts back slowly, more likely with a high starting prescription. |
| Flap complications | Rare | Problems with the corneal flap during or soon after surgery. Surgeons are trained to manage them. |
| Infection or inflammation | Rare | Needs prompt treatment. Following aftercare closely lowers the risk. |
| Ectasia | Rare | The cornea weakens and bulges over time. Pre-surgery corneal scans are designed to catch the risk. |
“Common”, “uncommon” and “rare” here are general descriptions. The real numbers vary by technology, surgeon and patient selection. We cover more in our list of LASIK side effects.
Who Is at Higher Risk of a Poor Result?
Most poor outcomes come from operating on someone who was not an ideal candidate. These factors raise the risk:
- An unstable prescription. If your glasses number is still changing, results are less predictable.
- Thin or irregular corneas, including early signs of keratoconus.
- Very high prescriptions, where more tissue has to be reshaped.
- Significant dry eye before surgery.
- Some health conditions, such as autoimmune disease or poorly controlled diabetes.
- Hormonal changes, for example during pregnancy or breastfeeding, which can shift the prescription.
- Unrealistic expectations. LASIK reduces dependence on glasses. It cannot promise perfect vision forever, and reading glasses are still usually needed with age.
How Proper Screening Lowers the Risk
The most effective way to avoid problems is a thorough check before surgery. It usually includes:
How to Reduce Your Own Risk
- Choose a clinic that does a full pre-surgery workup and is willing to say no.
- Tell your doctor about all medicines, health conditions and any family history of corneal disease.
- Follow aftercare exactly: prescribed drops, eye shield at night and no rubbing. See our eye surgery recovery guide.
- Go to every follow-up visit, even if you feel fine.
- Be honest with yourself about what you expect from the result.
Questions to ask your surgeon
What If the Result Isn’t Perfect?
Do not panic. The eye keeps healing for several weeks to months, and vision often improves during that time. If a small residual prescription remains once the eye has stabilized, your surgeon may offer an enhancement, provided there is enough corneal tissue. If not, a light pair of glasses or another procedure may be the better answer. If you are still comparing your options, see LASIK vs contact lenses and spectacles or LASIK.
When to Call Your Doctor Right Away
For everyday questions, see is LASIK painful?
Frequently Asked Questions
Is LASIK 100% successful?
No surgery is 100% successful. Most well-selected patients achieve excellent vision, but a small number need an enhancement or still need glasses for some tasks. Serious complications are rare.
What are the chances of LASIK going wrong?
For most patients, serious problems are uncommon, especially after careful screening. Minor issues like temporary dry eye and night glare are more common. Ask your surgeon for their own outcome data.
What is the failure rate of LASIK?
There is no single failure rate because studies define success differently. A fair answer separates results below the goal, side effects and serious complications, as explained in this guide. Ask your surgeon what their rate of enhancements and complications has been.
Can LASIK make my vision worse?
Rarely. A small number of people have lasting glare, dryness or other changes, and a very small number develop serious complications. Choosing the right candidates and following aftercare lowers this risk.
Is dry eye after LASIK permanent?
Usually not. Dry eye is common in the first weeks and months and improves for most people with lubricating drops. A small number have longer-lasting dryness that needs ongoing treatment.
Can LASIK be repeated?
Sometimes. If the prescription changes after the eye has stabilized, an enhancement may be possible, but only if there is enough corneal tissue and the eye is healthy. Your surgeon will decide after repeat tests.
Can my vision go back to needing glasses after LASIK?
It can. The prescription may drift back slightly over the years, and almost everyone needs reading glasses with age. LASIK corrects the cornea but does not stop the eye from changing.
Who should not get LASIK?
People with an unstable prescription, thin or irregular corneas, signs of keratoconus, severe dry eye or certain health conditions may not be suitable. A full eye test tells you whether LASIK is safe for you.
Related Reading
LASIK Side EffectsWhat to know before the laser.
Dry Eyes After LASIKWhy they happen and how to prevent them.
LASIK Eye SurgeryOur LASIK service and technology.
Not sure if LASIK is right for you?
A full eye test tells you whether you are a suitable candidate and what to expect. Read about our team on the About Us page or book a check-up.