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Superficial vascularization is the growth of new blood vessels into the superficial layers of the cornea, which normally has no blood vessels. It often reflects chronic irritation, inflammation, or low oxygen exposure on the corneal surface. New vessels can reduce corneal clarity and can make contact lens wear less comfortable. The underlying cause guides treatment and follow-up.
read more about superficial vascularization ...Contact lens overwear and low-oxygen lens use can stimulate vessel growth as the cornea responds to chronic hypoxia. Ongoing surface inflammation from dry eye, blepharitis, or allergic eye disease can also drive superficial vessels. Corneal infections, especially recurrent keratitis, can leave inflammation that promotes vascularization during healing. Chemical burns, trauma, and certain corneal surgeries can trigger vessel growth as part of a repair response. Limbal stem cell problems can also lead to persistent surface breakdown and progressive vascularization.
Many people notice chronic redness near the corneal edge and irritation that feels worse in wind, air-conditioning, or smoke. Vision can stay normal early, but clarity can drop when vessels and scarring reach the visual axis. Contact lens discomfort can increase because the cornea becomes more sensitive and inflamed. Light sensitivity and tearing can occur when the surface is unstable or when active inflammation is present. Pain, discharge, or sudden vision decline suggests infection or ulcer risk and needs prompt evaluation.
A slit-lamp exam can show vessel depth, direction of growth, and whether active inflammation is present at the vessel tips. Corneal staining with fluorescein helps check for surface defects that fuel inflammation and vessel growth. Photographs or corneal imaging can track whether vessels progress over time or regress after treatment changes. The exam also looks for the root cause, such as contact lens fit, eyelid inflammation, or active infection. Measuring corneal sensation and tear function can help when dryness is a major contributor.
Treatment starts by addressing the trigger, such as stopping extended-wear contact lenses and switching to higher-oxygen options when contact lens use continues. Lid hygiene, dry eye therapy, and allergy control can reduce surface inflammation that feeds vessel growth. In selected cases, a clinician may use topical anti-inflammatory drops, with careful monitoring because steroids can worsen infection risk when misused. Anti-VEGF treatment, laser, or fine-needle diathermy may be considered for problematic vessels, based on cornea specialist judgment. Severe cases tied to limbal stem cell failure can require surgical surface reconstruction.
Active vessels can shrink when the trigger is treated, and redness can improve over time. Some vessels become ghost vessels, which can remain faintly visible even after activity stops. Early treatment tends to limit permanent scarring and vessel density.
Yes, contact lens overwear and low-oxygen wear patterns are common causes. Risk increases with sleeping in lenses and wearing lenses longer than recommended. An eye doctor can review lens type, fit, and wear schedule to reduce recurrence.
It can be a warning sign of chronic surface stress that can reduce corneal clarity. Ongoing inflammation also raises risk of scarring and recurrent infection in some cases. Evaluation helps identify the driver and protect vision.
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