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What is photokeratitis / snowblindness?

Answer: 

Photokeratitis is a largely reversible sunburn of the cornea, often called snow blindness, resulting from overexposure to UV-B radiation.

It can come from spending excessive time at high altitudes in the open air with no sun protection.

The symptoms are usually short-lived and include eye pain, photophobia, excessive tearing and sensation of something in the eye.

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