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Photo Credit shih-wei/iStock/Getty Images. Magnesium is a naturally occurring element that people need as a key nutrient. The human body relies on magnesium for various purposes, and people who don't have enough can suffer various symptoms, through dry, itchy skin is not considered one of them.
A magnesium deficiency will not cause blurry vision, but other conditions may. If you experience gradual changes in your vision, it could indicate the need for a new eyeglass prescription, or you may have an eye condition such as cataracts or glaucoma.