1 A mathematical determination of the amount or number of something: finding ways of saving money involves complicated calculations [mass noun]: the calculation of depreciation. More example sentences. Synonyms. 1  Precise mathematical calculations are worked out and this determines how a person's life is affected.
A vitamin A deficiency can lead to a vision condition called, Keratomalacia. Symptoms of this condition include: night blindness, dry eyes (often extreme cases), blurred or clouded vision, and softening of the cornea.
Other Nutrients and Hair Loss. One vitamin that does pose problems for your hair when taken in excess is vitamin A. Hypervitaminosis A, or excess vitamin A, can cause hair loss when taken in excess of 50,000 international units per day, according to Huntington College of Health Sciences.