Visual pathway: parietal lobe: 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 · Visual pathway: parietal lobe

Sample item

Which field defect arises from a lesion of the right parietal optic radiation?

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

The answer and the reasoning

A. Left inferior homonymous quadrantanopia

Superior retinal fibres run in the parietal radiation and represent the inferior field, so the defect is pie on the floor on the opposite side. The parietal lobe may also give optokinetic nystagmus asymmetry.

Option by option

  • A. Left inferior homonymous quadrantanopia (correct)

    Correct. Parietal lesions give a contralateral inferior defect.

  • B. Right inferior quadrantanopia

    Retrochiasmal lesions give contralateral, not ipsilateral, loss.

  • C. Left superior homonymous quadrantanopia

    A superior defect arises in the temporal lobe.

  • D. Bitemporal hemianopia

    Bitemporal loss is chiasmal.

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 A, Left inferior homonymous quadrantanopia. Superior retinal fibres run in the parietal radiation and represent the inferior field, so the defect is pie on the floor on the opposite side.

Why is "Right inferior quadrantanopia" not the answer?

Retrochiasmal lesions give contralateral, not ipsilateral, loss.

Why is "Left superior homonymous quadrantanopia" not the answer?

A superior defect arises in the temporal lobe.

Why is "Bitemporal hemianopia" not the answer?

Bitemporal loss is chiasmal.

What concept does this question test?

It tests Visual pathway: parietal lobe in Ophthalmology. The parietal lobe may also give optokinetic nystagmus asymmetry.

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 Visual pathway: parietal lobe?

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.