Neuro-ophthalmology and pupils: Worth four dot test: 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 · Neuro-ophthalmology and pupils: Worth four dot test

Sample item

A child wearing red and green goggles looks at a lit box of four dots (one red, two green, one white). He sees five dots. What does this indicate?

ADiplopiaBSuppression of the right eyeCNormal binocular single visionDSuppression of the left eye

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

The answer and the reasoning

A. Diplopia

In the Worth four dot test, normal binocular single vision gives four dots, suppression of one eye gives two dots (red only) or three dots (green only), and diplopia gives five dots. The test grades fusion, suppression and diplopia.

Option by option

A. Diplopia (correct)
Correct. Five dots means each eye sees its own dots, which is diplopia.
B. Suppression of the right eye
Suppression of one eye leaves only two red dots or only three green dots, never five.
C. Normal binocular single vision
Normal fusion reports four dots, not five.
D. Suppression of the left eye
Suppression of either eye gives two or three dots, not five.

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.

Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is A, Diplopia. In the Worth four dot test, normal binocular single vision gives four dots, suppression of one eye gives two dots (red only) or three dots (green only), and diplopia gives five dots.

Why is "Suppression of the right eye" not the answer?

Suppression of one eye leaves only two red dots or only three green dots, never five.

Why is "Normal binocular single vision" not the answer?

Normal fusion reports four dots, not five.

Why is "Suppression of the left eye" not the answer?

Suppression of either eye gives two or three dots, not five.

What concept does this question test?

It tests Neuro-ophthalmology and pupils: Worth four dot test in Ophthalmology. The test grades fusion, suppression and diplopia.

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 Neuro-ophthalmology and pupils: Worth four dot test?

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.