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Vitamin A deficiency and its impact on vision
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Vitamin A deficiency and its impact on vision

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  • 1. • Major controllable nutritional problem.• 13.8 million children have some degreeof visual loss.• Approximately 250,000 to 500,000children go blind each year – Half diewithin a year.
  • 2. • Decreased dietary intake.• Impaired absorption.• Altered storage.• Increased utilization.• Chronic diarrhoea, malabsorption.
  • 3. • Night blindness.• Keratomalacia.• Conjunctival dryness, cornealdryness, xerophthalmia.• Bitot’s spots.• Corneal perforation.• Blindness due to structuraldamage to the retina.
  • 4. • Earliest symptom.• Eyes cannot adjustto dim light.• Individual findsdifficult todistinguish imagesin low levels ofillumination.
  • 5. • Softening of cornea.• Seen in earlychildhood due tovitamin A deficiency.• Subsequently leadsto corneal ulcerationand perforation.
  • 6. • Conjunctivaldryness owing tovitamin Adeficiency.• Follows chronicconjunctivitis andvitamin A deficiencydiseases.• Eyes fail to producetears in thiscondition.
  • 7. • Triangular or ovalfoamy, greyish spotsappearing on thecornea due to thedeficiency of vitamin A.
  • 8. • An anomaly in thecornea due to adamage in the cornealsurface.
  • 9. • Treatment for subclinicalvitamin A deficiencyincludes the consumptionof vitamin A-rich foods.• For clinically evidentvitamin A deficiency,treatment includes dailyoral vitamin Asupplements.
  • 10. Eating at least 5 servings offruits and vegetables perday is recommended inorder to provide acomprehensivedistribution ofcarotenoids.A variety of foods, such asbreakfast cereals,pastries, breads, etc., areoften fortified withvitamin A.

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