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Don’t undermine the sun, in particular when crossing large snow fields or large camps of bright volcanic ash. A proper head cover, sun cream and sun glasses are essential to prevent sun-burns and snow-blindness. Don’t just carry this stuff but use it preventively.   Snow-blindness can disable you for a few days if you did not wear sun clases 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].