Vitamin and Mineral Nutrition Information System (VMNIS)

Global prevalence of night blindness and number of individuals affected in populations of countries at risk of vitamin A deficiency 1995-2005

Globally, night blindness affects 5.2 million preschool-age children (95% CI: 2.0-8.4 million) and 9.8 million pregnant women (95% CI: 8.7-10.8 million), which corresponds to 0.9% and 7.8% of the population at risk of VAD, respectively.

Population groupa Prevalence of of night blindness Population affected
Percentb 95% CI Number
95% CI
Preschool-age children 0.9 0.3-1.5 5.17 1.99-8.38
Pregnant women 7.8 7.0-8.7 9.75 8.70-10.8

a Population subgroups: Preschool-age children (<5 years); Pregnant women (no age range defined).
b Numerator and denominator exclude countries with a 2005 GDP ≥US$ 15 000.


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.