Refraction: anisometropia: 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 · Refraction: anisometropia

Sample item

A patient with 4 D difference between the two eyes cannot tolerate spectacles because of unequal image size. What is this called and its best remedy?

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

The answer and the reasoning

D. Aniseikonia, corrected with contact lenses

Spectacles magnify or minimise images according to their power, and differences over about 3 D cause intolerable image-size disparity. Contact lenses reduce the difference.

Option by option

  • A. Diplopia, corrected with prisms

    Prisms do not fix image-size disparity.

  • B. Anisocoria, corrected with miotics

    Anisocoria is unequal pupil size.

  • C. Astigmatism, corrected with cylinders

    Astigmatism is a meridional refractive error.

  • D. Aniseikonia, corrected with contact lenses (correct)

    Correct. Contact lenses minimise aniseikonia.

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, Aniseikonia, corrected with contact lenses. Spectacles magnify or minimise images according to their power, and differences over about 3 D cause intolerable image-size disparity.

Why is "Diplopia, corrected with prisms" not the answer?

Prisms do not fix image-size disparity.

Why is "Anisocoria, corrected with miotics" not the answer?

Anisocoria is unequal pupil size.

Why is "Astigmatism, corrected with cylinders" not the answer?

Astigmatism is a meridional refractive error.

What concept does this question test?

It tests Refraction: anisometropia in Ophthalmology. Contact lenses reduce the difference.

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 Refraction: anisometropia?

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.