Snowblindness
Snow blindness is misleading as the person does not become blind. What happens is that the eye is irritated by the amount of UV exposure and can therefore be considered as a sunburn of the eyeball. What is interesting is that the sun does not have to be shining for this to develop - most cases occur on slightly ovecast days when there is no shadow.

Prevention

• polarized or amber-coloured sunglasses
• wear snow goggles
• keep your eyes fixed on dark objects
• look through your eyelashes
• blacken your nose and cheekbones with a grease/charcoal mixture

• gritty feeling in the eyes
• eyes become hot and sticky
• vision blurs and the eyes water
• sharp pain develops that is relieved by darkness

• make camp and apply cold compresses to the eyes
• shield the eyes as effectively as possible
• keep the person affected in a darkened area as long as required to relieve the symptoms