Bottom line: Temporary halos, starbursts, and glare around lights at night are common in the first one to three months after LASIK. They occur because the healing cornea scatters light differently than it did before. For the vast majority of patients, these symptoms resolve as the cornea heals. Modern wavefront-guided treatments have significantly reduced the incidence of persistent night vision problems.
What Causes Night Vision Changes
Your pupil dilates in low light to let in more light. After LASIK, if your dilated pupil is larger than the optical zone treated by the laser, light passing through the untreated peripheral cornea is refracted differently than light passing through the corrected central zone. This mismatch creates halos (rings around lights) and starbursts (rays extending from point light sources).
Timeline: When Night Vision Normalizes
| Period | What You'll Experience | Percentage of Patients Affected |
|---|---|---|
| Week 1–2 | Noticeable halos and glare, especially driving at night | 70–80% notice some effect |
| Month 1–3 | Gradual improvement, symptoms less distracting | 30–40% still notice mild effects |
| Month 3–6 | Most patients report normal or near-normal night vision | 10–15% notice occasional mild effects |
| Beyond 6 months | Stable — what you have at 6 months is typically permanent | 3–5% have persistent mild symptoms |
How Modern Technology Reduces Night Vision Issues
Larger optical zones (6.0–6.5mm vs older 5.5mm zones) cover more of the dilated pupil. Wavefront-guided treatments address higher-order aberrations that contribute to scatter. Better blend zones create smoother transitions between treated and untreated cornea. Topography-guided treatments (like Contoura) customize the ablation to your cornea's unique surface.
💡 If You Drive at Night
If night driving is a significant part of your routine, discuss your pupil size and optical zone with your surgeon during the consultation. Your surgeon can adjust the treatment plan to maximize the optical zone for your specific pupil measurements.
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