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What is a xerophthalmia?

What is a xerophthalmia? Here are some definitions.

Noun
  1. (ophthalmology) A condition due to a deficiency of vitamin A where the conjunctiva and cornea become dry. The condition starts with conjunctival xerosis and night blindness and progresses to corneal xerosis and, later, a severe condition called keratomalacia.
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Examples
Of these, 9 children had overt vitamin A deficiency as evident by the presence of xerophthalmia.
Although xerophthalmia is seldom encountered in countries where dairy products are readily available, it is common among poor children in Indonesia, Bangladesh, India, and the Philippines, and occurs in some parts of Africa.
A guide to their use in the treatment and prevention of vitamin A deficiency and xerophthalmia.
In xerophthalmia, the eyes are sensitive to light, the secretion of lubricating tears is stopped, and the eyelids become swollen and sticky with pus.
In the early 1990s, results from observational studies showed an increased mortality among children with clinical xerophthalmia.
This product has lost most of its vitamins A and D, which are needed to ward off xerophthalmia and rickets.

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