On spectral-domain OCT, a patient with progressive normal-tension glaucoma shows focal thinning of the retinal nerve fiber layer in the inferotemporal sector. This corresponds to which visual field defect?
- A Superior paracentral scotoma
- B Superior arcuate scotoma ✓
- C Inferior nasal step
- D Temporal wedge defect
Correct answer: B. Superior arcuate scotoma
Explanation
The inferotemporal RNFL contains arcuate nerve fibers that correspond to the superior visual field. Focal thinning in this sector produces a superior arcuate scotoma or nasal step. Superior RNFL thinning corresponds to inferior visual field defects. This anatomical mapping is fundamental to interpreting OCT in glaucoma.
Reference: AAO BCSC Section 10: Glaucoma, 2022-2023 ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.