Trauma: siderosis bulbi: 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: siderosis bulbi

Sample item

An iron foreign body retained for months causes rusty brown deposits on the lens and iris with a poor ERG. What is this?

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

The answer and the reasoning

C. Siderosis bulbi

Retained iron causes siderosis, with deposits in the epithelium of the lens, iris and retina, and toxicity to retinal cells, especially the photoreceptors. Early removal is required.

Option by option

  • A. Chalcosis

    Chalcosis is caused by copper.

  • B. Sympathetic ophthalmia

    Sympathetic ophthalmia is immune.

  • C. Siderosis bulbi (correct)

    Correct. Iron toxicity is siderosis.

  • D. Argyrosis

    Argyrosis is caused by silver deposition.

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 C, Siderosis bulbi. Retained iron causes siderosis, with deposits in the epithelium of the lens, iris and retina, and toxicity to retinal cells, especially the photoreceptors.

Why is "Chalcosis" not the answer?

Chalcosis is caused by copper.

Why is "Sympathetic ophthalmia" not the answer?

Sympathetic ophthalmia is immune.

Why is "Argyrosis" not the answer?

Argyrosis is caused by silver deposition.

What concept does this question test?

It tests Trauma: siderosis bulbi in Ophthalmology. Early removal is required.

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: siderosis bulbi?

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.