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What Is a Dellen?

A dellen is a shallow, localized dip on the corneal surface caused by tissue dehydration. The small hollow area usually forms next to a raised area such as a scar, pterygium, or recently healed surgical site. Because the tear film does not spread evenly across the dip, the tissue dries more easily and becomes thinner. People often notice blur, irritation, or a rough sensation around the affected spot. An eye exam can confirm the depth and location of the thinning.

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What Is a Dellen?

A dellen is a shallow, localized dip on the corneal surface caused by tissue dehydration. The small hollow area usually forms next to a raised area such as a scar, pterygium, or recently healed surgical site. Because the tear film does not spread evenly across the dip, the tissue dries more easily and becomes thinner. People often notice blur, irritation, or a rough sensation around the affected spot. An eye exam can confirm the depth and location of the thinning.

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Why Does a Dellen Form?

Dellen formation begins when the corneal surface loses even tear coverage. Raised lesions or recent surgical changes alter airflow and tear spread, leaving one area more exposed. Without steady moisture, the tissue in that spot dries out and thins. Sometimes swelling or scarring from nearby structures disrupts the normal blink pattern as well. Identifying the trigger helps guide treatment and prevent deeper tissue loss.

What Signs Suggest a Dellen?

Here are changes commonly linked with a dellen:

  • Localized thinning near a raised lesion or surgical site.
  • Faint gray or dull appearance in the affected area.
  • Irritation or foreign-body sensation.
  • Blur that improves briefly after blinking.
  • Slow healing of nearby corneal tissue.

How Do Doctors Treat a Dellen?

Treatment aims to restore moisture and protect the thinning area. Lubricating drops or gels keep the surface coated and help the tissue regain hydration. A soft bandage contact lens can shield the cornea while healing progresses. If a nearby lesion is responsible, managing that structure helps reduce repeat dryness. Doctors follow the area closely to confirm that the tissue thickens again as recovery continues.

Why Is Fast Treatment Important When a Dellen Is Found?

A dellen can deepen if the surface stays dehydrated, since the same uneven tear coverage keeps drying that spot out. Early lubrication protects the cornea before thinning reaches deeper layers where healing takes longer and scarring becomes more likely. Treatment also focuses on removing the trigger, such as a raised edge, swelling, or post-surgery contour that disrupts tear spread. Many cases improve quickly once moisture is restored, which is why doctors often treat dellen more aggressively than a simple dry spot. If irritation suddenly spikes after surgery or near a raised lesion, getting checked early can prevent bigger surface damage.

Frequently Asked Questions About a Dellen

Can a dellen cause permanent vision changes?

A small dellen usually heals once the surface stays moist again. If dehydration lasts too long, deeper layers can be affected and scarring might appear. Early care prevents this outcome. Regular follow-up helps track healing.

Does a dellen hurt?

Many people feel irritation or a gritty sensation rather than sharp pain. The dryness makes the tissue more sensitive to airflow and blinking. Lubricants often ease these symptoms quickly. A doctor can check for other surface issues if pain becomes stronger.

Can a dellen form after surgery?

Yes, raised edges or stitches after surgery can disrupt tear spread and lead to a dellen. Doctors often spot these early during follow-up visits. Keeping the surface well-lubricated reduces the chance of deeper thinning. Surgeons monitor nearby tissue closely.

How long does a dellen take to heal?

Healing depends on how dry and thin the area became before treatment. With steady lubrication, many resolve within days to weeks. Bandage lenses can speed recovery by protecting the surface. Regular visits show how quickly the cornea regains its smooth shape.

References

Corneal Dellen. EyeWiki. https://eyewiki.org/Corneal_Dellen. Accessed March 20, 2026.

Corneal Dellen. PubMed. https://pubmed.ncbi.nlm.nih.gov/38808908/. Accessed March 20, 2026.

Resolution of Corneal Dellen After an Uneventful Pterygium Surgery with Fibrin Glue. PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC7308917/. Accessed March 20, 2026.

Corneal "dellen" as a complication of strabismus surgery. PubMed. https://pubmed.ncbi.nlm.nih.gov/17676020/. Accessed March 20, 2026.

Treatment of corneal dellen with a large diameter soft contact lens. PubMed. https://pubmed.ncbi.nlm.nih.gov/21802977/. Accessed March 20, 2026.