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What Is Diffuse Lamellar Keratitis (DLK)?

Diffuse lamellar keratitis is an inflammatory reaction that appears beneath the corneal flap after LASIK surgery. The inflammation spreads across the interface layer, creating haze and sensitivity to light. People often describe blur or a sandy feeling shortly after the procedure. The condition can progress quickly during the first few days if not monitored closely. Early recognition allows doctors to prevent deeper scarring and restore clearer sight.

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What Is Diffuse Lamellar Keratitis (DLK)?

Diffuse lamellar keratitis is an inflammatory reaction that appears beneath the corneal flap after LASIK surgery. The inflammation spreads across the interface layer, creating haze and sensitivity to light. People often describe blur or a sandy feeling shortly after the procedure. The condition can progress quickly during the first few days if not monitored closely. Early recognition allows doctors to prevent deeper scarring and restore clearer sight.

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Why Does Diffuse Lamellar Keratitis Develop?

DLK starts when cells collect beneath the surgical flap. Tiny particles, micro-trauma, or surface dryness after the procedure can trigger this response. Some cases appear in clusters due to shared equipment or environmental factors in the surgical suite. Once the reaction begins, the cells spread through the interface layer. Timely follow-up exams help catch the process before it thickens.

What Signs Suggest Diffuse Lamellar Keratitis?

People with DLK often notice clues during the early post-surgery period:

  • Blur that increases over the first few days.
  • Crisp lines becoming hazy or washed out.
  • Light sensitivity stronger than expected after LASIK.
  • A gritty or sandy sensation beneath the lid.
  • Haze visible during slit-lamp exam.

How Do Doctors Treat Diffuse Lamellar Keratitis?

Treatment aims to calm inflammation and protect the surgical interface. Doctors often adjust drop schedules to target the reaction quickly. In stronger cases, the flap is lifted and the interface is rinsed to clear out cells or debris. Close monitoring helps confirm that the inflammation does not spread deeper. Most people regain their pre-flare clarity once the reaction settles.

What Should You Do If DLK Symptoms Show Up After LASIK?

If blur or light sensitivity starts increasing in the first few days after LASIK, it is safer to contact the surgeon right away rather than waiting for it to "settle." DLK can move quickly, and early treatment is what helps protect the flap interface from haze that lasts longer. Avoid rubbing the eye, and do not skip follow-up visits, even if symptoms feel mild at first. Doctors may adjust drops or bring you in sooner for a closer slit-lamp check. Prompt care often leads to a quicker return to clear vision.

Frequently Asked Questions About Diffuse Lamellar Keratitis

Can DLK harm long-term vision?

When caught early, DLK usually clears without lasting harm. If inflammation spreads unchecked, it can leave some surface irregularity. Prompt follow-up speeds recovery and protects clarity. People with early symptoms should contact their surgeon quickly.

Is DLK an infection?

DLK is an inflammatory reaction, not an infection. No bacteria or fungi are involved. The cells that gather under the flap behave differently from germs. Doctors still check carefully to rule out other causes.

How soon does DLK appear after LASIK?

DLK usually shows up within the first few days after surgery. This early window is why follow-up visits are closely spaced. Symptoms can shift quickly during this time. Regular checks help guide treatment decisions.

Can DLK recur?

Most people have only one episode, but a flare can happen again if the eye faces similar triggers. Careful monitoring after future surgeries helps. If symptoms return, doctors act quickly to settle the reaction. Staying alert to early clues can make a difference.

References

Diffuse Lamellar Keratitis. EyeWiki. https://eyewiki.org/Diffuse_Lamellar_Keratitis. Accessed March 20, 2026.

LASIK Complications. EyeWiki. https://eyewiki.org/LASIK_Complications. Accessed March 20, 2026.

A Review of Diffuse Lamellar Keratitis, Central Toxic Keratopathy, and Transient Light Sensitivity Syndrome. PubMed. https://pubmed.ncbi.nlm.nih.gov/40601513/. Accessed March 20, 2026.

Pathophysiology and Treatment of Diffuse Lamellar Keratitis. PubMed. https://pubmed.ncbi.nlm.nih.gov/32032434/. Accessed March 20, 2026.

Diffuse lamellar keratitis: identification and management. PubMed. https://pubmed.ncbi.nlm.nih.gov/10941648/. Accessed March 20, 2026.