Neuro-ophthalmology and pupils: visual evoked potential: 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 and pupils: visual evoked potential

Sample item

Months after optic neuritis, a woman's acuity is 6/6 and the disc looks normal, but she says vision remains abnormal. Which test would show a delayed P100 latency to confirm past optic nerve demyelination?

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

The answer and the reasoning

B. Visual evoked potential

The visual evoked potential measures conduction along the visual pathway, and demyelination delays the P100 latency even when acuity recovers. The electroretinogram records retinal activity and is normal in optic nerve disease. It is also used to assess unexplained visual loss.

Option by option

  • A. Electroretinogram

    The ERG tests photoreceptors and bipolar cells and is normal in optic neuropathy.

  • B. Visual evoked potential (correct)

    Correct. Prolonged P100 latency shows slow conduction in the optic nerve.

  • C. Fluorescein angiography

    Angiography shows vascular leakage and does not measure conduction.

  • D. Electro-oculogram

    The EOG tests the retinal pigment epithelium and photoreceptor function.

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, Visual evoked potential. The visual evoked potential measures conduction along the visual pathway, and demyelination delays the P100 latency even when acuity recovers.

Why is "Electroretinogram" not the answer?

The ERG tests photoreceptors and bipolar cells and is normal in optic neuropathy.

Why is "Fluorescein angiography" not the answer?

Angiography shows vascular leakage and does not measure conduction.

Why is "Electro-oculogram" not the answer?

The EOG tests the retinal pigment epithelium and photoreceptor function.

What concept does this question test?

It tests Neuro-ophthalmology and pupils: visual evoked potential in Ophthalmology. The electroretinogram records retinal activity and is normal in optic nerve disease. It is also used to assess unexplained visual loss.

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 and pupils: visual evoked potential?

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.