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. 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.