Neuro-ophthalmology and pupils: Riddoch phenomenon: 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: Riddoch phenomenon

Sample item

A patient with a large occipital infarct is blind to static targets in the right hemifield, yet reports seeing a waved hand in that field. What is this phenomenon?

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

The answer and the reasoning

A. Riddoch phenomenon

In the Riddoch phenomenon, patients with cortical visual field loss can perceive moving objects in the blind field though not static targets. It is also called statokinetic dissociation.

Option by option

  • A. Riddoch phenomenon (correct)

    Correct. Perception of motion in a blind field is Riddoch phenomenon.

  • B. Balint syndrome

    Balint syndrome combines simultanagnosia, optic ataxia and ocular apraxia.

  • C. Anton syndrome

    Anton syndrome is denial of blindness in cortical blindness.

  • D. Charles Bonnet syndrome

    Charles Bonnet syndrome is formed visual hallucinations in people with visual loss and preserved insight.

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, Riddoch phenomenon. In the Riddoch phenomenon, patients with cortical visual field loss can perceive moving objects in the blind field though not static targets.

Why is "Balint syndrome" not the answer?

Balint syndrome combines simultanagnosia, optic ataxia and ocular apraxia.

Why is "Anton syndrome" not the answer?

Anton syndrome is denial of blindness in cortical blindness.

Why is "Charles Bonnet syndrome" not the answer?

Charles Bonnet syndrome is formed visual hallucinations in people with visual loss and preserved insight.

What concept does this question test?

It tests Neuro-ophthalmology and pupils: Riddoch phenomenon in Ophthalmology. It is also called statokinetic dissociation.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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: Riddoch phenomenon?

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.