Boojho was having difficulty in seeing things in dim light. The doctor tested his eyesight and prescribed a particular vitamin supplement. He also advised him to include a few food items in his diet. (a) Which deficiency disease is he suffering from? (b) Which food component may be lacking in his diet? (c) Suggest some food items that he should include in his diet, (any four)

Boojho is suffering from night blindness.

Explanation

Night blindness (nyctalopia) is your inability to see well at night or in poor light such as in a restaurant or movie theater. Your eyes are constantly adjusting to light. When you’re in low or no light, your pupils (that black circle in the center of your eyes) will get bigger (dilate) so that more light will enter your eye. That light is then received by the retina – tissue in the back of your eye that houses all of the rod and cone cells.

Night blindness has many possible causes, including:

  • Myopia (nearsightedness).
  • Glaucoma medications that work by constricting the pupil.
  • Cataracts.
  • Retinitis pigmentosa.

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