Visual snow refers to the phenomenon that people see thickly dotted spots when they see things, which is especially obvious when they are watching the skies at night or the dark places after the light is off. The exact causes of visual snow is still in discussion, while the patients with migraineur usually suffer from the visual snow. It is supposed that the visual snow is also related with high pressure, overuse of eyes, and so on. Dehydration might be one factor to cause visual snow. Dehydration can lead to dry eyes, because the eyes need plenty of water to keep themselves moist as well as transporting nutrients and wastes. If the eyes lack water due to dehydration, the eyes will feel dry, itchy, and fatigue, which makes it hard to see things clearly. Therefore, drinking water and taking vegetables and fruits is very important to the normal function of eyes.
