Snow blindness is medically called “photokeratitis” which causes eye damage temporarily when the eyes are exposed to prolonged sunlight. It would cause painful condition on the eyes and people who travel more in snowy regions or on high altitudes are prone to snow blindness. Very often, the powerful UV rays of the sun would burn the cornea of the eyes. Initially it will not be noticed but after some time, there would be considerable pain on the eyes or severe eye twitching.
Causes :
Snow blindness is caused by prolonged exposure of UV light of the sun. People who are traveling in elevated areas or snowy glaciers will be under constant exposure of powerful sunlight reflected from the snow. Obviously, snow is capable of reflecting back 75-80% of UV rays and hence it is necessary to take protective goggles before proceeding to hiking snowy peaks.
Who are at risk?
Frequent travelers who often visit snowy terrain and climbing high altitudes are at the risk of developing snow blindness. People who are actively involved in hiking activities like tourists guide are more prone to develop this problem than others.