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.
Vitamin A for night blindness. A poor diet, especially deficient in vitamin A, can lead to the development of night blindness. Retina cells contains a molecule called retinal which is necessary to see under low conditions of light and to distinguish the different colors of things.