Photokeratitis
(Redirected from Snow blindness)
Photokeratitis is a painful eye condition caused by exposure of insufficiently protected eyes to the ultraviolet (UV) rays from either natural (e.g. intense sunlight) or artificial (e.g. the electric arc during welding) sources. Photokeratitis is akin to a sunburn of the cornea and conjunctiva, and is not usually noticed until several hours after exposure. Symptoms include increased tears and a feeling of pain, likened to having sand in the eyes.
Causes[edit | edit source]
The principal sources causing photokeratitis are the ultraviolet rays from the sun, reflection of the sun from snow and ice, and exposure to the UV rays from artificial sources like the electric arc used in welding.
Symptoms[edit | edit source]
The symptoms of photokeratitis can be uncomfortable and distressing. They include:
- A sensation of having sand in the eyes
- Pain in the eyes
- Redness
- Blurry vision
- Sensitivity to light
- Swelling around the eyes
- Temporary vision loss or color changes in vision
Prevention[edit | edit source]
Prevention of photokeratitis primarily involves protection of the eyes from UV light by wearing sunglasses that block 99–100% of UV rays, and a hat to block indirect sunlight. For snow sports, well-fitted wrap-around sunglasses or goggles are essential to block sunlight from snow and ice. Welders can prevent photokeratitis by using proper eye protection with the appropriate filters.
Treatment[edit | edit source]
Treatment for photokeratitis is primarily supportive. This can include:
- Avoiding further exposure to the sun or bright light
- Using artificial tears or lubricating ointments
- Taking pain relievers
- Using a cool, wet compress on the eyes
See also[edit | edit source]
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