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The Most Feared Complication After LASIK

And how modern techniques prevent it

4 min readNov 18, 2025

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An exaggerated depiction of an eye withker atoconus — the bulging of the cornea so it looks like the eye has a slight cone shape to its surface.
I created this with AI. It’s fairly exaggerated, but it gives you the general idea.

Humans worry — it’s a survival instinct.

But when it comes to this particular concern, I want to help put your mind at ease.

Based on questions I get online, in consults, and even from friends, most people know refractive surgery is safe, millions of people do it every year, and that it’s a very quick and virtually painless process.

But sometimes, the fear of a complication known as keratectasia makes them hesitate.

What Exactly Is Keratectasia

Keratectasia —corneal ectasia — is a progressive thinning and bulging of the cornea that can occur months or even years after surgery.

It is where the cornea slowly loses structural stability and begins to protrude forward. Vision becomes distorted, irregular, and harder to correct with glasses.

This used to be one of the greatest concerns with LASIK. Not because it was common, but because when it happened, it had a significant impact on the daily life of the individual.

Why It Happens

The cornea is made up of 3 layers:

  • The top layer is thin and protective.

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Yasuyuki Nakae, MD
Yasuyuki Nakae, MD

Written by Yasuyuki Nakae, MD

Japanese eye surgeon trained in Japan. I specialise in refractive surgeries such as LASIK. See better, see more, enjoy life!

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We curate & disseminate outstanding stories from diverse domains to create synergy. Apply: https://digitalmehmet.com/contact & https://illumination-curated.com