This patient-education article is written by the cornea service at Suraj Eye Institute, Nagpur.

What is Post-LASIK Ectasia?

Post-LASIK ectasia is a progressive forward bulging and thinning of the cornea that appears months or years after laser refractive surgery — LASIK, SMILE or PRK. The condition produces irregular astigmatism, blurred vision and frequent prescription changes that cannot be fully corrected with spectacles.

Refractive surgery removes a thin layer of central corneal tissue to reshape the eye. In an eye whose cornea was already biomechanically weak (often a subtle, undetected keratoconus called forme fruste keratoconus) the removal of tissue allows the remaining cornea to yield under the constant pressure of the aqueous humour, producing an ectatic cone similar to keratoconus.

Pre-LASIK vs Post-LASIK Ectasia

Cross-Section: Pre-LASIK Cornea vs Post-LASIK Ectasia

PRE-LASIK CORNEA Anterior chamber ~540 µm ✓ Smooth dome · uniform thickness

POST-LASIK ECTASIA Anterior chamber LASIK flap interface Thin residual stromal bed <400 µm Anterior protrusion ✗ Thinned, ectatic · irregular astigmatism

Figure 1. The pre-LASIK cornea (left) is a smooth dome of uniform thickness (~540 µm centrally). After LASIK (right), a thin anterior flap (dotted) and an underlying residual stromal bed remain. If the bed is too thin or the cornea was biomechanically weak to begin with, the cornea bulges forward into an ectatic cone — usually inferior or paracentral — producing irregular astigmatism and blurred vision.

Risk Factors

Pre-operative screening with corneal tomography aims to detect risk before any laser is fired. The major risk factors are:

  • Forme fruste or subclinical keratoconus on Anterion, even when slit-lamp examination looks normal
  • A thin pre-operative cornea
  • A high refractive correction requiring deep tissue ablation
  • Young age at surgery and high myopia
  • Habitual eye-rubbing after surgery

Symptoms

Patients typically have an initially excellent post-LASIK result, followed months to years later by a gradual decline in vision, frequent prescription changes, increasing astigmatism, glare and ghosting of images. Any patient with worsening vision after LASIK should be screened.

How Post-LASIK Ectasia is Diagnosed

Diagnosis is made with corneal topography and swept-source OCT tomography (Anterion). The classical signs are increased posterior corneal elevation, inferior or paracentral steepening on the axial map and progressive thinning at the cone apex. Comparison with the pre-LASIK scan, where available, confirms progression.

Treatment

The aim is to halt progression and rehabilitate vision. Treatment depends on severity:

  • Corneal collagen crosslinking (CXL) — the first-line intervention. CXL stiffens the residual stromal bed and stops further bulging in the majority of eyes.
  • Specialty contact lenses (rigid gas-permeable, hybrid or scleral) for visual rehabilitation when spectacles can no longer correct the irregular astigmatism.
  • Intracorneal ring segments in selected cases to regularise the corneal shape.
  • Deep anterior lamellar keratoplasty (DALK) or penetrating keratoplasty (PK) — reserved for very advanced disease with scarring or contact lens intolerance.
Eye-rubbing matters here too. Vigorous, repetitive eye-rubbing accelerates progression of ectasia. The first instruction to every patient is: do not rub your eyes.
✔ Post-LASIK Ectasia Care at Suraj Eye Institute

Our cornea service offers Anterion swept-source OCT tomography for early ectasia detection, accelerated and standard corneal collagen crosslinking, specialty contact lens fitting (scleral, RGP and hybrid) for visual rehabilitation, and DALK or PK for advanced cases. As a NABH-accredited tertiary centre, we provide co-ordinated long-term follow-up.

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Frequently Asked Questions

Could I have had ectasia risk before my LASIK?
Possibly yes. About half of post-LASIK ectasia cases are linked to a subclinical keratoconus (forme fruste) that was present but undetected before surgery. This is why modern pre-LASIK screening always includes Anterion tomography.

Will my vision get worse forever?
Not if you act promptly. Corneal crosslinking, performed early, halts further progression in the majority of eyes. Specialty contact lenses then restore functional vision in most patients without surgery.

Can I have LASIK again to fix the ectasia?
No. Further laser refractive surgery is absolutely contraindicated in any eye with ectasia, as it removes more tissue from an already weakened cornea and accelerates the problem.

Will I need a corneal transplant?
Only a minority of patients ever need transplantation. The majority achieve good functional vision with crosslinking and well-fitted specialty contact lenses. Transplant (DALK or PK) is reserved for advanced disease with scarring.

How often will I need follow-up?
Follow-up is typically every 3–6 months in the first one to two years, with serial Anterion scans to confirm that progression has stopped. Long-term annual review is recommended thereafter.

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