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 ...
Vitamin A. Vitamin A is vital for night vision, but it also affects tears. Lack of vitamin A damages the tear film. A prolonged deficiency causes severe dry eye, which can lead to eye ulcers, scarring and blindness, reports the Linus Pauling Institute.our diet can help prevent or treat dry eyes. Photo Credit Branislav Ostojic/Hemera/Getty Images. Lack of tears in your eyes causes dry eyes. Proteins, minerals and vitamins are all critical for making tears, which means that a lack of vitamins could increase your risk for developing dry eyes.