Xerophthalmia: WHO classification: practice question

A Ophthalmology question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Ophthalmology · Xerophthalmia: WHO classification

Sample item

In the WHO classification of xerophthalmia, what does stage X3A denote?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. Corneal ulceration or keratomalacia involving less than one third of the cornea

X3A and X3B are corneal ulcers or keratomalacia involving less than one third or more than one third of the cornea. Night blindness is XN, conjunctival xerosis X1A and Bitot's spots X1B.

Option by option

  • A. Night blindness

    Night blindness is XN.

  • B. Conjunctival xerosis

    Conjunctival xerosis is X1A.

  • C. Xerophthalmic fundus

    Xerophthalmic fundus is XF.

  • D. Corneal ulceration or keratomalacia involving less than one third of the cornea (correct)

    Correct. X3A is keratomalacia involving less than one third of the cornea.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is D, Corneal ulceration or keratomalacia involving less than one third of the cornea. X3A and X3B are corneal ulcers or keratomalacia involving less than one third or more than one third of the cornea.

Why is "Night blindness" not the answer?

Night blindness is XN.

Why is "Conjunctival xerosis" not the answer?

Conjunctival xerosis is X1A.

Why is "Xerophthalmic fundus" not the answer?

Xerophthalmic fundus is XF.

What concept does this question test?

It tests Xerophthalmia: WHO classification in Ophthalmology. Night blindness is XN, conjunctival xerosis X1A and Bitot's spots X1B.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Xerophthalmia: WHO classification?

Group the red eye by what to examine and what the pupil does. Then use the flashcards and the other Ophthalmology questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.