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.
Diet & Nutrition. 1  Vitamin A is the most clearly researched deficiency associated with night blindness. 2  Zinc if you have a zinc deficiency, then zinc combined with vitamin A is more helpful than vitamin A alone.1. 3  See our recommendations for diet / lifestyle.  Vegetables.