Snow Blindness: Meaning, Origin & Winter Safety Guide
Quick Definition (Home, Driving & Survival Rules)
A painful sunburn of the corneas (photokeratitis) caused by intense ultraviolet (UV) rays reflecting off fresh white snow — which bounces back up to 80–90% of solar UV radiation from the ground up into your eyes.
Also called: photokeratitis, ultraviolet keratitis, glare blindness
If you only do three things
- Wear 100% UV400 sunglasses or snow goggles outdoors whenever snow covers the ground.
- Remember that bright overcast clouds over fresh snow can still cause snow blindness.
- If your eyes feel gritty or burned after a day in snow, rest in a dark room and do NOT rub them.
Origin, meteorology & what "Snow Blindness" means
Indigenous Arctic peoples recognized snow blindness thousands of years ago and carved ingenious narrow-slit snow goggles ('ilgaak' or 'nigaugek') from driftwood, bone, or caribou antler to block reflected glare off the tundra.
While green grass or dark soil reflects only 3% to 10% of UV light, fresh snow acts like a giant mirror reflecting 80%+ of UV rays, meaning your eyes receive nearly double the normal dose of ultraviolet radiation — even on an overcast winter day.
Real-world winter safety & what to do
Always wear UV400 sunglasses or tinted snow goggles when driving, walking, skiing, or shoveling on bright snowy days after a storm.
Symptoms of snow blindness (gritty 'sand in the eyes' pain, watering, redness, light sensitivity, and halo vision) usually appear 6 to 12 hours after exposure. Move into a dark room, remove contact lenses, apply cool damp cloths over closed eyelids, and never rub your eyes while the cornea heals over 24 to 48 hours.
Frequently asked questions about Snow Blindness
Is snow blindness permanent?
Usually no — the corneal surface cells regenerate within 24 to 72 hours if you rest your eyes out of UV light, though repeated unprotected exposure contributes to cataracts.
Can dogs get eye damage from snow glare too?
High-altitude working dogs and breeds prone to pannus (like German Shepherds) can suffer UV eye irritation on bright snowfields.
Related situational guides
- Cold Health & Winter First Aid: Recognizing and treating winter health hazards.
- What to Wear in Snow: Protecting eyes, face, and skin in snowy conditions.