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What Is Photokeratitis?

Photokeratitis is an acute, painful inflammation of the corneal epithelium caused by intense ultraviolet light exposure. Common sources include sunlight reflected from snow or water, tanning beds, and welding arcs without proper eye protection. UV energy damages epithelial cells, which then slough off several hours after exposure. Symptoms are delayed and often begin after the triggering activity is over. The condition is sometimes called snow blindness or welder's flash.

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What Is Photokeratitis?

Photokeratitis is an acute, painful inflammation of the corneal epithelium caused by intense ultraviolet light exposure. Common sources include sunlight reflected from snow or water, tanning beds, and welding arcs without proper eye protection. UV energy damages epithelial cells, which then slough off several hours after exposure. Symptoms are delayed and often begin after the triggering activity is over. The condition is sometimes called snow blindness or welder's flash.

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Causes and Risk Factors for Photokeratitis

High altitude skiing, mountaineering, or spending long hours on bright snow or water without UV blocking eyewear are classic scenarios. Welders who use inadequate shields or watch arcs without protection are also at high risk. Tanning beds and broken UV filters in lamps can create similar exposure. Thin or dry tear films may slightly increase vulnerability to surface damage. Short, intense bursts of UV are more harmful than lower, chronic levels in this context.

Symptoms and Clinical Features

Symptoms usually begin several hours after exposure and include severe eye pain, foreign body sensation, tearing, and marked light sensitivity. Patients often cannot open their eyes comfortably and describe sand in the eyes. Vision becomes blurred until the epithelium heals. On slit lamp exam, there is diffuse punctate epithelial staining or confluent epithelial loss across the exposed cornea, with injected conjunctiva and swollen lids. Both eyes are often involved because exposure is typically bilateral.

How Is Photokeratitis Diagnosed?

Diagnosis is clinical and based on a history of recent intense UV exposure plus typical findings. The eye doctor asks about outdoor activities, use of sunglasses or goggles, welding, or tanning bed use in the previous day. Fluorescein staining highlights widespread punctate defects across the interpalpebral cornea. Other causes of acute bilateral pain, such as chemical injury, are ruled out by history and exam. No lab tests are usually needed.

How Is Photokeratitis Managed?

Management focuses on comfort while the corneal epithelium regenerates, which usually happens within 24 to 72 hours. Lubricating drops and ointments soothe the surface, and oral pain medicine is often required. Cycloplegic drops can reduce ciliary spasm and light sensitivity. Bandage contact lenses are used in some settings under supervision. Patients are advised to avoid further UV exposure until healing is complete and to use proper eye protection in the future.

FAQs About Photokeratitis

How long does photokeratitis last?

Most cases improve significantly within 24 to 48 hours as new epithelial cells cover the surface. Full comfort and visual recovery often follow within a few days, though symptoms can be intense during the first night.

Can photokeratitis cause permanent vision loss?

Single episodes usually heal without lasting damage, but very severe or repeated exposures can cause scarring or chronic dry eye. Protective eyewear greatly reduces this risk.

Is photokeratitis like a sunburn of the eye?

Yes, it is similar in concept. UV light injures the corneal surface cells, which then peel away, much like sunburned skin. The difference is that the cornea is very sensitive, so symptoms feel much more dramatic.

How can I prevent photokeratitis when skiing or welding?

Wear goggles or glasses with strong UV blocking lenses and side protection, and never look directly at welding arcs without approved shields. For outdoor sports, wraparound sunglasses and helmets with visors help protect eyes from reflected light.