LASIK risks & side effects

The honest short version

If you are thinking about LASIK, the first thing to know is simple: there is no zero-risk vision surgery. Ads often focus on convenience and clear vision. They may say much less about dry eye, night-vision problems, healing issues, or the fact that some people are not good candidates.

LASIK changes the cornea with a laser after creating a thin flap in the front of the eye. For many people, recovery is fairly quick. But quick recovery does not mean no downside. Side effects and complications can happen, and some people need more time, more treatment, or decide a different procedure is a better fit.

A few key points:
- Common side effects can include dry eye, glare, halos, starbursts, light sensitivity, and blurry or fluctuating vision during healing.
- Less common problems can include under-correction, over-correction, irregular vision, or needing an enhancement later.
- Rare but serious complications can include infection, flap problems, ectasia, and lasting vision changes. In very rare cases, serious vision loss can occur.
- Many people are not candidates for LASIK because of corneal shape, prescription level, dry eye, age-related changes, or other eye findings.

If you want a fuller overview of the process and candidacy, start with candidacy and the exam or read more about LASIK.

Common side effects people should know before they book a consult

These are the issues people hear about most often because they are the ones that come up most often in real life.

Dry eye

Dry eye is one of the best-known side effects after LASIK. For some people it is mild and temporary. For others it is more noticeable and lasts longer than expected. Symptoms can include burning, grittiness, watering, fluctuating vision, and discomfort with screens or air conditioning. If your eyes are already dry before surgery, that matters. An honest surgeon should take that seriously.

Glare, halos, and starbursts

Night-vision symptoms are another common concern, especially early in healing. Lights may look smeared, have rings around them, or feel harsh at night. Some people notice this mostly when driving. For many, these symptoms improve with time. For some, they can continue and remain bothersome.

Blurry or fluctuating vision during healing

Vision after LASIK is not always a straight line from blurry to perfect. It can go up and down while the eyes heal. One eye may seem sharper than the other for a while. That uncertainty can be stressful, and it is one reason you should not assume the fastest recovery stories will match your experience.

Light sensitivity and discomfort

Some irritation, tearing, or light sensitivity can happen in the early period after surgery. That does not automatically mean something is wrong, but it is still part of the real recovery experience that people should hear about clearly before making a decision.

These are general patterns, not medical advice. Only an in-person exam with a licensed eye surgeon can tell you how these risks may apply to your eyes.

Less common but important: when the result is not what you hoped for

A lot of people ask, "What if I still need glasses?" That is a fair question.

LASIK is an attempt to reduce dependence on glasses or contacts, but it does not promise a perfect result for every person. The eye can heal in ways that are a little different than planned.

Here are some of the more important non-rare disappointments people should understand:

1. Under-correction: your prescription is reduced, but not as much as you expected.
2. Over-correction: the treatment goes too far, leaving a different focusing problem.
3. Regression: vision improves, then changes again over time.
4. Irregular visual quality: your chart vision may look decent, but vision still does not feel crisp or comfortable.
5. Enhancement surgery: some people need a second procedure later, if the surgeon thinks it is appropriate and safe.

This does not mean LASIK is a bad option. It means expectations need to be realistic. Some people are happy even if they still use thin glasses for night driving. Others would be disappointed by that. Knowing your own expectations matters.

Age matters too. LASIK does not stop normal aging of the eye. If you are near the age when reading glasses become common, LASIK does not make that future disappear. A surgeon should explain that plainly.

If you are comparing procedures, some people may be better suited for PRK or another option instead of LASIK. The right procedure, or no procedure, depends on the exam.

Rare serious risks that should never be hidden

These problems are less common, but they are the reason LASIK should be treated like real surgery, not a simple beauty service.

• Infection: uncommon, but potentially serious. Fast treatment matters.
• Flap complications: because LASIK creates a corneal flap, there can be flap-related problems during or after surgery.
• Ectasia: a weakening and bulging of the cornea after surgery. This is one reason screening matters so much.
• Scarring or inflammation: can affect healing and visual quality.
• Lasting vision changes: some people report ongoing visual symptoms or reduced quality of vision even if standard testing looks acceptable.
• Rare vision loss: uncommon, but real enough that it should be stated openly.

These are not meant to scare you. They are meant to give you the full picture. A careful surgeon screens for corneal thickness, shape, prescription stability, and other signs that may suggest LASIK is not a good choice. Sometimes the safest answer is "not you" or "not now."

That is a good sign, not a bad one. A surgeon who says no may be protecting your eyes.

For a fuller general overview, read LASIK risks and side effects and are you a candidate for LASIK?.

What to do before you decide, and common mistakes to avoid

You do not need to rush this decision. A good next step is a consultation with a licensed ophthalmologist, but there are smart ways to prepare.

What to do

1. Write down your real goal. Is it less dependence on contacts? Better sports convenience? Easier daily life? Be specific.
2. Ask about risk in plain language. Ask what side effects are common, what serious complications they personally screen for, and why they think LASIK is or is not a fit.
3. Ask what happens if the result is not ideal. Would glasses still be likely? When is an enhancement considered? What follow-up is typical?
4. Compare more than one consultation if you want. You are allowed to slow down and think.
5. Ask about cost honestly. In the US, LASIK often runs about $2,000-$3,000 per eye, but real cost varies by the eyes, technology, surgeon, and area. These are estimates, not quotes, and surgery is rarely covered by insurance.

Common mistakes

• Choosing based only on the lowest price.
• Treating marketing language like a medical opinion.
• Assuming everybody is a candidate.
• Ignoring existing dry-eye symptoms.
• Thinking "quick recovery" means "no real risk."
• Feeling pressured to book surgery before you are ready.

Sightlume is a free matching service. We do not perform surgery, examine eyes, diagnose, or tell you which procedure you should have. We can help you get matched with licensed eye surgeons near you for a consultation, and then you compare, ask questions, and decide who to trust. No surgery happens without an exam first.

This page is general educational information, not medical advice. Only a licensed eye surgeon, after an in-person exam, can say whether LASIK, another procedure, or no surgery is the safest fit for you.