MCQ Detailed View

Vitamin A is the key vitamin responsible for maintaining healthy eyesight in humans. It plays a critical role in preserving vision, particularly in low-light conditions, and preventing several eye-related diseases caused by deficiency.

Vitamin A contributes to the production of rhodopsin, a light-sensitive pigment found in the retina of the eye. This pigment allows the eyes to detect light and see clearly in dim environments. A lack of Vitamin A reduces rhodopsin production, leading to night blindness, one of the first symptoms of deficiency. Severe, prolonged deficiency can damage the cornea, resulting in xerophthalmia (dry eyes) and even permanent blindness if untreated.

Apart from vision, Vitamin A supports the overall health of eye tissues, keeping them moist and protected from infections. It also plays a role in the proper functioning of the immune system and the growth of cells throughout the body.

The main sources of Vitamin A include:

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  Animal-based foods: Liver, fish liver oil, dairy products, eggs.

  
  


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  Plant-based foods: Carrots, sweet potatoes, spinach, broccoli, and other leafy greens containing beta-carotene, which the body converts into Vitamin A.

  
  

Here’s why the other options are not correct:

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  Vitamin B: Supports energy metabolism and nerve health, but not directly related to vision maintenance.

  
  


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  Vitamin C: Important for immunity and skin, and may reduce the risk of cataracts but is not the primary vitamin for eyesight.

  
  


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  Vitamin D: Essential for bones and calcium absorption, not directly linked to vision improvement.

  
  

In conclusion, Vitamin A is the vitamin that most strongly promotes healthy eyesight, making it crucial for preventing night blindness and maintaining proper functioning of the human eyes.