Glaucoma: OCT RNFL: 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 · Glaucoma: OCT RNFL

Sample item

Which test objectively measures retinal nerve fibre layer thickness to detect glaucoma before field loss?

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

The answer and the reasoning

C. Optical coherence tomography

OCT gives micron resolution images of the RNFL and ganglion cell layer, detecting structural loss before functional field defects. Perimetry assesses function. Gonioscopy views the angle.

Option by option

  • A. Gonioscopy

    Gonioscopy assesses angle structures.

  • B. Goldmann perimetry

    Perimetry assesses visual field function.

  • C. Optical coherence tomography (correct)

    Correct. OCT measures RNFL thickness.

  • D. A-scan ultrasonography

    A-scan measures axial length.

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.

More Ophthalmology questions

Questions about this Ophthalmology question

What is the answer to this Ophthalmology question?

The best answer is C, Optical coherence tomography. OCT gives micron resolution images of the RNFL and ganglion cell layer, detecting structural loss before functional field defects.

Why is "Gonioscopy" not the answer?

Gonioscopy assesses angle structures.

Why is "Goldmann perimetry" not the answer?

Perimetry assesses visual field function.

Why is "A-scan ultrasonography" not the answer?

A-scan measures axial length.

What concept does this question test?

It tests Glaucoma: OCT RNFL in Ophthalmology. Perimetry assesses function. Gonioscopy views the angle.

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 Glaucoma: OCT RNFL?

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.