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.
1 Mal-absorption of vitamin A by the body can also lead to its deficiency. It can be due to sprue, celiac disease, obstructive jaundice, cirrhosis, giardiasis, cystic fibrosis or an over use of mineral oil as laxative.  Over excretion of urine is also known to cause Vitamin A deficiency.