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Halos and glare after LASIK: causes, timeline and fixes

Are halos and glare normal after LASIK?

Yes, especially in the first weeks. The FDA lists glare and halos among the normal early symptoms after LASIK, and says glare, halos and difficulty driving at night may persist while vision stabilises, which can take three to six months.

Halos are rings around lights; glare is a dazzling spread of light that reduces contrast; starbursts are rays spreading from a point of light. They are most noticeable at night, when the pupil is wide, and around headlights, street lamps and bright screens in a dark room.

Many people notice them most on the first evenings, then mainly on night drives or when looking at bright LED signs, which Seoul has plenty of. Keep a simple note of when you notice them, so you can tell your surgeon whether they are improving.

How common are halos and glare after LASIK?

Common enough that you should expect some. In the FDA's PROWL studies, published in JAMA Ophthalmology, 43% of participants in one study and 46% in the other who had no visual symptoms before surgery reported at least one new symptom, such as glare, halos, starbursts or double images, three months after LASIK.

Most of those symptoms were not severe, and overall satisfaction remained high: only 1–4% were dissatisfied with their vision. The PROWL authors also noted that symptoms are often under-reported in routine follow-up, so it is worth mentioning them to your surgeon even if they seem minor.

What causes halos and glare after LASIK?

Several things, often together:

• Dry eye: an uneven tear film scatters light. This is the most common and most treatable cause.
• Early swelling and flap healing: the cornea is slightly hazy for days to weeks.
• Higher-order aberrations: small optical imperfections the laser can create, particularly at the edge of the treatment zone. A 2007 study in the British Journal of Ophthalmology found halo disturbance more than doubled (by a factor of 2.15) after LASIK and correlated with total higher-order aberrations and spherical aberration.
• Large pupils relative to the treatment zone: at night, light can pass through the untreated edge.
• Residual prescription: a small under- or over-correction blurs lights at night.

Pre-operative scans and a full exam help predict risk; see the pre-op eye exam in Korea.

Can I lower my risk of halos before surgery?

Partly, through careful screening and choosing the right procedure. A thorough pre-operative exam measures your prescription, corneal shape and thickness, tear film and pupil size in dim light, and your surgeon uses those results to choose the treatment and the size of the treated zone.

• Tell your surgeon if you drive a lot at night or already notice halos with glasses or contact lenses.
• Treat existing dry eye before surgery; it is a common, fixable cause of glare.
• Ask whether a customised treatment, such as wavefront-guided or topography-guided ablation, suits your eyes.
• Ask how your prescription affects your risk; the FDA notes results are generally less good for very large prescriptions.
• For very high prescriptions or thin corneas, ask whether a lens option such as ICL is better suited.

No screening removes the risk entirely, and the FDA lists night-vision problems among LASIK's known risks.

How long do halos and glare last?

For most people they fade within 3–6 months, as the tear film recovers and the cornea settles. Improvement is gradual, so compare month to month rather than day to day.

How do halos compare after SMILE, PRK/LASEK and ICL?

All refractive procedures can cause night-vision symptoms; the pattern differs.

What can be done if halos and glare persist?

Treat dry eye first, then look for a residual prescription. Options your surgeon may discuss:

• Lubricating drops, gels and other dry eye treatment.
• Glasses for night driving to correct a small residual error; the AAO notes some people still need glasses for activities such as night driving.
• An enhancement once measurements are stable, sometimes customised, such as wavefront-guided LASIK or topography-guided treatment.

The FDA lists night vision problems among LASIK risks that can occasionally be lasting. See LASIK side effects.

When are halos a warning sign?

New halos that appear suddenly with pain, redness or worsening vision need a same-day check. After ICL, halos with eye pain, headache or nausea can mean raised eye pressure. Night driving advice is in driving after LASIK. This is general information; ask your surgeon about your own eyes.

Sources

• FDA – What should I expect during and after surgery?
• AAO EyeNet – Postoperative symptoms and satisfaction with LASIK (PROWL)
• British Journal of Ophthalmology (2007) – Night vision disturbances after successful LASIK
• Clinical Ophthalmology (2022) – EVO/EVO+ Visian ICL six-month results
• AAO – LASIK laser eye surgery

FAQ

Frequently asked questions

Do halos after LASIK go away?

For most people they fade over 3–6 months as the eye heals and the tear film recovers. A small minority have lasting symptoms that may need treatment.

How common are halos after LASIK?

In the FDA's PROWL studies, 43–46% of people reported a new visual symptom such as halos, glare or starbursts at three months. Most were not bothersome.

Does SMILE cause fewer halos than LASIK?

Both can cause halos, and results depend more on your eyes and prescription than on the procedure name. Ask your surgeon about your pupil size and treatment zone.

Can dry eye cause halos?

Yes. An uneven tear film scatters light, which is why treating dry eye often reduces halos and glare.

Can halos be fixed after LASIK?

Often they can be reduced: dry eye treatment, glasses for night driving, or a customised enhancement once vision is stable. Not every case can be fully corrected.

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