Discussion
Match the classification of xerophthalmia with appropriate abbreviation :
| Column-I (Classification) | Column-II (Abbreviation) |
|---|---|
| 1. Night blindness | a. X1A |
| 2. Conjunctival xerosis | b. X1B |
| 3. Bitot's spot | c. X2 |
| 4. Corneal xerosis | d. XN |
Choose the most appropriate option from below :
Answer: A
The correct matching is 1-d, 2-a, 3-b, 4-c.
The WHO classification of xerophthalmia, the eye signs of vitamin A deficiency, uses these codes:
- XN: night blindness, the earliest sign (1-d).
- X1A: conjunctival xerosis, a dry, wrinkled conjunctiva (2-a).
- X1B: Bitot's spots, foamy grey patches on the conjunctiva (3-b).
- X2: corneal xerosis, a dry, hazy cornea (4-c).
The more severe stages X3A and X3B are corneal ulceration and keratomalacia. Every other option misplaces night blindness or swaps the conjunctival and corneal codes.
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