1. Introduction
Vitamin A deficiency is a major public health problem that affects preschool age children primarily in the regions of Africa and South East Asia [1]. Inadequate or low intakes of vitamin A between the ages of 6 and 59 months can lead to vitamin A defi- ciency which in severe cases can cause visual impairment, night blindness as well as an increased risk of illness from infections such as measles and diarrhoea [2]. World Health Organization (WHO) regional estimates indicate that the highest proportion of preschool age children affected by night blindness is in Africa at 2% which is four times higher than estimated rates in South East Asia at 0.5% [2]. Vitamin A deficiency is among the 19 top risk