An example of MS-DOS's command-line interface, this one showing that the current directory is the root of drive C. MS-DOS (/ËÉmÉsËdÉs/ EM-es-DOSS; acronym for Microsoft Disk Operating System) is a discontinued operating system for x86-based personal computers mostly developed by Microsoft.
Written by: Kierstan Boyd. Nov. 08, 2012. 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.
WHY VITAMIN A. Vitamin A deficiency is a public health problem all around the world, affecting more than 100 countries. A lack of vitamin A weakens the immune system, putting a child at greater risk of disease and early death; and it is also the leading cause of preventable child blindness.he solution for correcting vitamin A deficiency lies in improving the childâs diet â through increased consumption of vitamin A-rich foods, naturally rich or commercially fortified foods such as processed oils or sugar.