Causes include ill-fitting contact lenses, infections like keratitis, and chemical injury.

In some cases, this may be just a mild issue.

In others, it may be severe enough to warrant treatment that may even require transplantation.

A person gets an eye exam

mixetto / Getty Images

mixetto / Getty Images

Symptoms: How Does Corneal Pannus Look?

This is a clear area that is usually free of blood vessels.

So, with this, you may see branches of blood vessels in unexpected places.

This is a condition that, if not successfully treated, can ultimately threaten your sight.

But a contact lens may block this.

VEGF leads to new blood vessel formation, which can ultimately affect vision.

Pannus can lead to scarring, which can affect corneal transparency.

This leads to hazy or blurry vision.

Such issues typically occur in advanced stages and can permanently threaten sight.

Treatment can vary from simple drops early on to laser surgery or corneal transplantation in more complicated cases.

Here’s what to know.

Another possible approach is to administer anti-VEGF agents.

Vascular endothelial growth factors encourage the development of new blood vessels.

Anti-VEGF agents can help keep VEGF from working here.

Moderate to Severe Symptoms

If medications are not effective here, a surgical approach may be needed.

This condition can be linked to contact lens use, particularly if these are ill-fitting.

It can also be triggered by infection or chemical insult.

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Kellogg Eye Center University of Michigan.Corneal neovascularization.

American Academy of Ophthalmology.Corneal neovascularization.

Sharif Z, Sharif W.Corneal neovascularization: updates on pathophysiology, investigations & management.Rom J Ophthalmol.

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American Academy of Ophthalmology.Could exercise help prevent eye damage?