Which of the following vitamin deficiency causes Bitot's spot and Xerophthalmia?

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Applied Nutrition & Dietetics

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

Vitamin A deficiency causes a spectrum of eye disorders known as Xerophthalmia, which means 'dry eye'.
Bitot's spots are a specific and characteristic sign of Vitamin A deficiency. They appear as triangular, foamy, white patches on the conjunctiva.
Vitamin A is crucial for vision, particularly in dim light, as it is a component of the retinal pigment rhodopsin. It also maintains the health of epithelial tissues like the conjunctiva and cornea.
The progression of eye damage from Vitamin A deficiency is predictable, starting with night blindness and advancing to irreversible blindness if not treated.

Option A: Vitamin D deficiency primarily affects bone health, not the eyes in the manner described.
Option B: Vitamin K is essential for blood clotting. Its deficiency leads to bleeding disorders, not Bitot's spots.
Option D: Vitamin E deficiency is rare and is primarily associated with neurological problems and hemolytic anemia, not specific ocular signs like Bitot's spots.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Ocular manifestations of Vitamin A deficiency as background academic context rather than a clinical decision trigger.
Nurses play a vital role in nutritional screening and identifying patients at risk for vitamin deficiencies, especially children and pregnant women in underserved communities.
Patient education is a key nursing responsibility. This includes teaching families about affordable, locally available dietary sources of Vitamin A, such as dark green leafy vegetables, carrots, sweet potatoes, mangoes, and papaya.
Early recognition of signs like night blindness can prevent progression to irreversible blindness. A nurse is often the first healthcare professional to hear a mother's concern about her child's inability to see in the evening.

How to Approach the Question

First, identify the key clinical terms in the question: 'Bitot's spot' and 'Xerophthalmia'.
Recognize that these are highly specific, classic signs of a particular nutritional deficiency.
Systematically review the functions and deficiency diseases of the fat-soluble vitamins listed in the options (A, D, E, K).
Recall that Vitamin A is directly linked to vision and eye health. Match the specific signs (Bitot's spot, Xerophthalmia) to Vitamin A deficiency.
Eliminate the other options by confirming their primary roles: Vitamin D for bone health (Rickets), Vitamin K for blood clotting, and Vitamin E as an antioxidant with neurological roles.
Confirm your choice. The unique and specific nature of Bitot's spots makes Vitamin A the only plausible answer.

Concept Tested & Keywords

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