Neuro-ophthalmology: 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 · Neuro-ophthalmology

Sample item

Which visual-field defect results from a pituitary mass compressing the optic chiasm?

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

The answer and the reasoning

D. Bitemporal hemianopia

A midline optic-chiasm lesion disrupts crossing nasal retinal fibres, producing loss of temporal visual fields in both eyes.

Option by option

  • A. Left homonymous hemianopia

    Homonymous loss localizes to retrochiasmal pathways.

  • B. Monocular central scotoma

    Central scotoma usually involves optic nerve or macula.

  • C. Right inferior quadrantanopia

    Quadrantanopia reflects partial retrochiasmal lesions.

  • D. Bitemporal hemianopia (correct)

    Correct: crossing nasal fibres carry temporal field information.

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.

More Ophthalmology questions

Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is D, Bitemporal hemianopia. A midline optic-chiasm lesion disrupts crossing nasal retinal fibres, producing loss of temporal visual fields in both eyes.

Why is "Left homonymous hemianopia" not the answer?

Homonymous loss localizes to retrochiasmal pathways.

Why is "Monocular central scotoma" not the answer?

Central scotoma usually involves optic nerve or macula.

Why is "Right inferior quadrantanopia" not the answer?

Quadrantanopia reflects partial retrochiasmal lesions.

What concept does this question test?

It tests Neuro-ophthalmology in Ophthalmology. The correct option holds because: Correct: crossing nasal fibres carry temporal field information.

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 Neuro-ophthalmology?

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.