Aphakia: optical features: 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 · Aphakia: optical features

Sample item

A patient with uncorrected aphakia has an unusually deep anterior chamber and an iris that trembles on movement. What is this sign called?

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

The answer and the reasoning

B. Iridodonesis

Without the lens to support it, the iris shakes with eye movement and is called iridodonesis. A tremulous lens in subluxation shows phacodonesis.

Option by option

  • A. Hippus

    Hippus is spontaneous pupil oscillation.

  • B. Iridodonesis (correct)

    Correct. Trembling of the iris is iridodonesis.

  • C. Phacodonesis

    Phacodonesis is trembling of the lens.

  • D. Argyll Robertson pupil

    Argyll Robertson pupil is a light-near dissociation.

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, Iridodonesis. Without the lens to support it, the iris shakes with eye movement and is called iridodonesis.

Why is "Hippus" not the answer?

Hippus is spontaneous pupil oscillation.

Why is "Phacodonesis" not the answer?

Phacodonesis is trembling of the lens.

Why is "Argyll Robertson pupil" not the answer?

Argyll Robertson pupil is a light-near dissociation.

What concept does this question test?

It tests Aphakia: optical features in Ophthalmology. A tremulous lens in subluxation shows phacodonesis.

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 Aphakia: optical features?

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.