The main symptom of vitamin A deficiency is vision loss and blindness.
Vision loss often begins as a problem adjusting to seeing in the dark, or night blindness. People with night blindness do not see well in the dark, but are able to see normally if enough light is present. As the vitamin A deficiency worsens, the conjunctiva, the covering on the white of the eye that helps lubricate your eye, dries out, and corneal ulcers appear. The progression of the deficiency eventually leads to vision loss and blindness.
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