Colour vision: acquired: 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 · Colour vision: acquired

Sample item

Which type of colour vision defect is typically seen in optic nerve disease such as ethambutol toxicity?

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

The answer and the reasoning

D. Red-green defect

Optic nerve disorders usually produce red-green defects, while macular and retinal disorders more often give blue-yellow defects (Kollner's rule). Ishihara plates test red-green defects.

Option by option

  • A. No defect

    Colour loss is an early feature of optic neuropathy.

  • B. Complete monochromacy

    Monochromacy is rare and congenital.

  • C. Blue-yellow defect

    Blue-yellow defects are typical of retinal and glaucoma disease.

  • D. Red-green defect (correct)

    Correct. Optic neuropathies typically give red-green loss.

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 D, Red-green defect. Optic nerve disorders usually produce red-green defects, while macular and retinal disorders more often give blue-yellow defects (Kollner's rule).

Why is "No defect" not the answer?

Colour loss is an early feature of optic neuropathy.

Why is "Complete monochromacy" not the answer?

Monochromacy is rare and congenital.

Why is "Blue-yellow defect" not the answer?

Blue-yellow defects are typical of retinal and glaucoma disease.

What concept does this question test?

It tests Colour vision: acquired in Ophthalmology. Ishihara plates test red-green defects.

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 Colour vision: acquired?

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.