Metric system. Metric system, international decimal system of weights and measures, based on the metre for length and the kilogram for mass, that was adopted in France in 1795 and is now used officially in almost all countries.
However, if taken in large doses, vitamin D side effects may include: Thirst; Metallic taste in the mouth; Increased urination; Decreased appetite; Weight loss; Constipation; Vomiting; Diarrhea; Itchy skin; Loss of muscle tone; Irritability; Tiredness; Sore eyes; Pain in the bones and joints ...
Dry Eyes From a Vitamin A Deficiency. Close-up of a man's dry eye. Photo Credit cesaria1/iStock/Getty Images. The front of your eye has a clear lubrication that coats the surface, and this substance, called the tear film, nourishes and protects your eye.If your eyes do not make the right amount of tears, or if you make tears of a poor quality, you may have dry eye.This condition causes surface irritation, redness and episodes of blurry vision. Certain conditions, such as low vitamin A levels, may increase your risk for dry eye problems.ther Effects. In addition to dry eye problems, a vitamin A deficiency may result in other conditions. A severe or long-term deficiency may result in vision changes, including blindness, particularly in children.