Neuro-ophthalmology: homonymous hemianopia: 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: homonymous hemianopia

Sample item

A patient cannot see the left visual field of either eye after a stroke. Where is the lesion most likely?

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

The answer and the reasoning

B. Right retrochiasmal visual pathway

Homonymous visual-field defects arise from lesions posterior to the optic chiasm. Loss of the left hemifield in both eyes localizes to the right retrochiasmal pathway.

Option by option

  • A. Left optic nerve only

    An optic nerve lesion causes monocular visual loss.

  • B. Right retrochiasmal visual pathway (correct)

    Correct. Contralateral retrochiasmal lesions cause homonymous field loss.

  • C. Right lens

    Lens opacity causes generalized blur, not a hemifield defect.

  • D. Both corneas

    Corneal disease causes surface symptoms and reduced acuity, not homonymous fields.

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 B, Right retrochiasmal visual pathway. Homonymous visual-field defects arise from lesions posterior to the optic chiasm.

Why is "Left optic nerve only" not the answer?

An optic nerve lesion causes monocular visual loss.

Why is "Right lens" not the answer?

Lens opacity causes generalized blur, not a hemifield defect.

Why is "Both corneas" not the answer?

Corneal disease causes surface symptoms and reduced acuity, not homonymous fields.

What concept does this question test?

It tests Neuro-ophthalmology: homonymous hemianopia in Ophthalmology. Loss of the left hemifield in both eyes localizes to the right retrochiasmal pathway.

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: homonymous hemianopia?

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.