Cambios

Snow-blindness can disable you for a few days if you did not wear sun glasses while crossing large snow fields in bright sunlight. The effect of snow-blindness are normally not felt until several hours after exposure when the symptoms (pain, intense tears, eyelid twitching, discomfort) become evident. See also the wikipedia article to [https://en.wikipedia.org/wiki/Photokeratitis Photokeratitis].

====Volcanic Eruptions====