Define Prevention of vitamin A deficiency?

Since dietary inadequacy is the major cause for micronutrient deficiencies, the most rational approach to prevent these deficiencies would be to ensure adequate amounts of the nutrients in the daily diets of the population at risk. There are two basic approaches to achieve this:

i) Long term programmes for promotion of adequate intakes of foods rich in micronutrients, and

ii) supplementation of specific nutrients either as medicinal doses or though food fortification to meet immediate needs In view of the serious nature of the problems, many countries have been adopting short-term measures, which though are interim in nature.