Trauma: intraocular foreign body: 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 · Trauma: intraocular foreign body

Sample item

A worker hammering metal has a corneal entry wound and suspected intraocular foreign body. Which imaging is contraindicated?

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

The answer and the reasoning

B. MRI if the object may be ferromagnetic

Magnetic fields can move a ferromagnetic foreign body and damage the eye, so MRI is avoided until the object is excluded or known to be non-metallic. CT is the best test.

Option by option

  • A. B-scan ultrasound with caution

    Ultrasound may help with caution.

  • B. MRI if the object may be ferromagnetic (correct)

    Correct. MRI is dangerous with magnetic fragments.

  • C. CT orbit

    CT is the investigation of choice.

  • D. Plain orbital X-ray

    X-ray may be used as a screening test.

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, MRI if the object may be ferromagnetic. Magnetic fields can move a ferromagnetic foreign body and damage the eye, so MRI is avoided until the object is excluded or known to be non-metallic.

Why is "B-scan ultrasound with caution" not the answer?

Ultrasound may help with caution.

Why is "CT orbit" not the answer?

CT is the investigation of choice.

Why is "Plain orbital X-ray" not the answer?

X-ray may be used as a screening test.

What concept does this question test?

It tests Trauma: intraocular foreign body in Ophthalmology. CT is the best test.

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 Trauma: intraocular foreign body?

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.