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Vitamin A deficiency is considered a mild public health problem in populations
when one or more of the following are true: prevalence of night blindness <
1%, prevalence of serum retinol < 0.7 micromole/l of < 10%, and prevalence
of breast milk retinol levels < 1.05 micromole/l also < 10%.
The public
health implications are severe when vitamin A deficiency indicators are at the
following levels: night blindness in 5% or more of children, low serum retinol
in 20% or more of the population and low breast milk retinol levels for 25% or
more of mothers.
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