Vitamin and Mineral Nutrition Information System (VMNIS)

Number of countries categorized by public health significance of night blindness 1995-2005a

The prevalence of night blindness is of moderate to severe public health significance in 45 countries for preschool-age children and 66 countries for pregnant women.


Public health problemb Preschool-age childrenc Pregnant women
Number of countries Number of countries
None 4 90
Mild 107 0
Moderate 42 66
Severe 3 0

a Excludes 37 countries with a 2005 GDP ≥US$ 15 000.
b The prevalence of night blindness as a public health problem in preschool-age children is categorized as follows: ≤0%, no public health problem; >0 - <1%, mild public health problem; ≥1 - <5%, moderate public health problem; ≥5%, severe public health problem. The prevalence of night blindness as a public health problem in pregnant women is categorized as ≥5%.
c Population groups: Preschool-age children (<5 years); Pregnant women (no age range defined).

Source

WHO. Global prevalence of vitamin A deficiency in populations at risk 1995–2005. WHO Global Database on Vitamin A Deficiency. Geneva, World Health Organization, 2009.

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