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What Is Keratoneovascularization?

Keratoneovascularization is the ingrowth of new blood vessels from the limbus into the normally avascular cornea. These vessels can be superficial, deep, or both, and they often follow chronic inflammation or hypoxia of the corneal tissue. While vascularization brings immune cells and nutrients, it also compromises transparency and can promote scarring. In corneal grafts, neovascularization increases the risk of rejection.

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What Is Keratoneovascularization?

Keratoneovascularization is the ingrowth of new blood vessels from the limbus into the normally avascular cornea. These vessels can be superficial, deep, or both, and they often follow chronic inflammation or hypoxia of the corneal tissue. While vascularization brings immune cells and nutrients, it also compromises transparency and can promote scarring. In corneal grafts, neovascularization increases the risk of rejection.

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Causes of Keratoneovascularization

Common causes include long standing contact lens overwear with hypoxia, chronic infectious or inflammatory keratitis, and ocular surface diseases such as rosacea or blepharitis related keratopathy. Chemical injuries, limbal stem cell deficiency, and prior surgery can also trigger vessel growth. The cornea responds to chronic stress by upregulating proangiogenic factors like VEGF. Understanding the underlying driver is central to planning treatment and prevention.

Symptoms and Clinical Features

Patients may notice redness, decreased vision, or increased light sensitivity, although mild vascularization can be asymptomatic. On slit lamp exam, fine branching vessels are seen crossing from the limbus into the corneal stroma or epithelium. Lipid exudation can occur along vessel paths, further clouding the cornea. In grafted corneas, new vessels near the graft host junction are particularly concerning. The pattern and depth of vessels help determine severity and prognosis.

How Is Keratoneovascularization Diagnosed?

Diagnosis is made clinically with slit lamp examination. The ophthalmologist assesses the location, depth, and extent of invading vessels and checks for associated scarring or lipid deposition. Anterior segment photography or angiography documents progression and response to therapy. Corneal sensation, tear film status, and lid health are evaluated to find contributing surface disease. In graft patients, topography and pachymetry help monitor graft health along with vascular changes.

How Is Keratoneovascularization Managed?

Management focuses on treating the underlying cause and directly reducing vessel growth. Improving contact lens practices, controlling blepharitis, and treating chronic inflammation with lubricants and anti inflammatory drops are initial steps. Topical or subconjunctival anti VEGF agents, fine needle cautery, or laser photocoagulation are used to regress problematic vessels in selected cases. In advanced disease, surgical options such as lamellar grafting or keratoplasty are considered. Lifelong avoidance of triggers supports long term clarity.

FAQs About Keratoneovascularization

Can corneal blood vessels disappear once they form?

Some superficial new vessels can regress or become less prominent when inflammation is controlled and anti VEGF treatment is used. Deep, long standing vessels are harder to eliminate completely. Even so, reducing flow and leakage can improve clarity.

Does keratoneovascularization always affect vision?

Small peripheral vessels may not disturb sight, but central or dense vascularization and lipid deposition often blur vision. The impact depends on how close vessels come to the visual axis and how much scarring develops.

Why is corneal neovascularization a problem for grafts?

Blood vessels bring immune cells and antibodies into contact with donor tissue, raising the chance of rejection. Highly vascularized host beds are considered high risk for keratoplasty. Careful preoperative treatment of vessels improves graft survival.

Can contact lens wear cause keratoneovascularization?

Yes, tight or low oxygen lenses worn for long periods can deprive the cornea of oxygen and trigger vessel growth. Modern high oxygen lenses, limited wear time, and regular follow up reduce this risk.