Does SMILE LASIK Cause Night Blindness?

Introduction: When Night Vision Becomes a Real-Life Concern

Imagine this: You’re driving through Gwangan Bridge at night, neon lights reflecting off the sea, headlights flaring in the rain. For many in Busan, this isn’t just a pretty scene—it’s a test of vision. Even a small halo or glare can turn a routine drive into a stressful one.

That’s why one of the most common questions we hear at Jryn Eye Clinic is:
“Doctor, if I get SMILE LASIK, will I struggle to see at night? Could it cause night blindness?”

This question carries weight. Some patients have friends who had LASIK years ago and still complain of halos. Others worry because of what they’ve read online—stories of people struggling after surgery. And some confuse the everyday use of “night blindness” with a medical diagnosis.

We believe patients deserve a clear, honest answer. SMILE LASIK has reshaped the way we think about vision correction, offering precision and safety beyond older methods. But like any surgery, it comes with questions and temporary adjustments. Let’s explore what night blindness really means, what SMILE patients may experience, and how we approach this at Jryn Eye Clinic.

What Night Blindness Really Means

First, let’s clear up terminology. In medical language, night blindness (nyctalopia) is not caused by corneal laser surgery at all. It’s usually linked to retinal or systemic problems, such as:

• Retinitis pigmentosa – a progressive genetic disease that limits peripheral and night vision.

• Vitamin A deficiency – more common in regions with malnutrition, not in modern Korea.

• Advanced glaucoma – damaging the optic nerve, leading to poor night adaptation.

• Cataracts – clouding of the lens, causing glare and dimness.

SMILE LASIK, by contrast, reshapes the cornea—the clear front layer of the eye. It does not affect the retina or the photoreceptors that handle low-light vision.

So, to be direct: SMILE LASIK does not cause true night blindness.

What patients often mean, however, is that they fear temporary changes in night vision quality after surgery, such as:

• Glare or halos around headlights

• Starbursts from streetlamps

• Reduced contrast when reading in dim light

• Sensitivity to bright lights at night

These are not signs of disease—they are part of the normal healing process.

Why Night Vision Can Change After SMILE

Think of your cornea as the lens of a camera. A lens that has just been adjusted may scatter light differently until it stabilizes. That’s essentially what happens after SMILE.

During the early weeks:

• The cornea is still settling into its new shape.

• The tear film may be unstable, scattering light in dim environments.

• The brain is adapting to new visual input, especially at night.

Compared to older procedures, SMILE minimizes these issues because:

• It uses a 2–3 mm incision, not a full flap.

• It preserves more corneal nerves, reducing dry eye.

• The femtosecond laser creates a smooth lenticule, limiting optical irregularities.

In short, SMILE is designed to reduce night vision complications, but it doesn’t erase the fact that your eyes need time to adjust.

Who Is More Likely to Notice Night Vision Disturbances?

From our experience treating patients in Busan, some individuals are more sensitive than others. Factors include:

• High prescriptions: Greater corrections can slightly increase the chance of halos.

• Large pupils: In dark environments, larger pupils may allow more peripheral light, accentuating glare.

• Dry eye tendencies: A common issue in Korea due to long hours on screens, especially among office workers and students.

• Lifestyle demands: Bus drivers, taxi drivers, late-night delivery riders, and students studying in dim cafés notice even subtle changes.

This is why personalized screening is critical. At Jryn Eye Clinic, we use wavefront aberrometry and corneal topography to predict how each patient might respond. For example, if we know someone has very large pupils, we tailor the treatment zone accordingly.

What Science and Studies Show

Clinical studies back up what we see in real life:

• A 2021 Journal of Refractive Surgery study found that SMILE patients reported lower glare and halo symptoms compared to LASIK patients, particularly after six months.

• Research in American Journal of Ophthalmology shows that night vision disturbances improve steadily within 3–6 months, rarely persisting long-term.

• Contrast sensitivity (the ability to distinguish shades of gray in low light) tends to return to baseline or improve after SMILE.

In fact, for many patients, night vision is better after SMILE because they are no longer battling the distortions of glasses or contact lenses.

A Patient Story: From Worry to Relief

Let me share the story of Mr. Kim, a 34-year-old office worker in Seomyeon. He loved night drives along the coastal roads but hated the glare from headlights. His prescription was -6.50 diopters, and he had heard horror stories about night vision after LASIK.

After SMILE, his first week was tough—halos around streetlights made him nervous about driving. But with proper lubrication and reassurance, things improved quickly.

At his three-month visit, he laughed and said:
“Doctor, I thought I’d never enjoy night driving again, but it’s actually clearer than with glasses. No fog, no reflections—just the road.”

This is typical of what we see: early sensitivity, followed by lasting clarity.

Cultural Context: Why Night Vision Matters More in Korea

Night vision isn’t just a medical curiosity—it’s part of daily life in Korea. Consider:

• Late-night commutes: Many Koreans work long hours, commuting home well after sunset.

• 24-hour lifestyle: Convenience stores, cafés, and noraebang keep people active at night.

• Driving culture in Busan: With its coastal highways and neon-lit city streets, glare can be particularly noticeable.

• Gaming and studying: Many young adults spend hours in dimly lit PC rooms or study cafés.

For these lifestyles, night clarity is not optional—it’s essential. That’s why at Jryn Eye Clinic, we pay special attention to how patients will function in low-light conditions after surgery.

How to Support Clearer Night Vision During Recovery

There are practical steps every patient can take to minimize disturbances:

• Use artificial tears regularly: A stable tear film smooths the optical surface.

• Protect against dryness: Limit long hours in front of screens during early recovery.

• Avoid night driving early on: Especially in Busan’s bright cityscape.

• Follow postoperative instructions: Anti-inflammatory drops and check-ups are crucial.

• Stay patient: Neural adaptation—the brain’s adjustment to new optics—takes time.

At Jryn Eye Clinic, we reassure patients that these steps are temporary investments in a lifetime of clearer vision.

Long-Term Outlook: What to Truly Expect

The reality is reassuring:

• SMILE does not cause night blindness.

• Night vision disturbances, when they occur, are temporary and improve over months.

• Many patients actually report better night driving vision than they ever had with glasses.

• Permanent complications are extremely rare, especially with careful screening.

We often remind patients: the goal of SMILE is not just to see better in daylight, but to live confidently in every condition—day, night, rain, or shine.

Conclusion: Clear Vision, Day and Night

To be honest, much of the fear around night blindness after eye surgery comes from outdated technology and online anecdotes. SMILE has changed the landscape. With its minimally invasive design, precision laser technology, and excellent safety record, it offers patients sharper vision with fewer complications.

At Jryn Eye Clinic, our philosophy is simple: treat each patient as an individual, not just a prescription. That means thorough diagnostics, honest conversations, and long-term care.

If you’re worried about night vision after SMILE, know this: the risk of permanent problems is exceedingly low, and most patients end up seeing better at night than they ever did before.

If you’ve been considering vision correction, we invite you to schedule a consultation at Jryn Eye Clinic in Busan. Together, we’ll evaluate your eyes, discuss your lifestyle, and plan a treatment that keeps your world clear—not just in the daytime, but in every moment of life.