Optical coherence tomography angiography (OCTA) differs from conventional FFA in that it:
- A Requires intravenous fluorescein dye injection for retinal vasculature imaging
- B Is the gold standard for detecting active choroidal neovascularization leakage
- C Can detect choriocapillaris flow without intravenous dye and provides depth-resolved vascular maps ✓
- D Provides better assessment of optic disc pallor than FFA
Correct answer: C. Can detect choriocapillaris flow without intravenous dye and provides depth-resolved vascular maps
Explanation
OCTA is a non-invasive imaging modality that detects erythrocyte motion using sequential B-scan OCT images to produce depth-resolved vascular flow maps of the retina and choroid without dye injection. FFA requires intravenous fluorescein and detects leakage but not layer-specific flow. While OCTA shows the structural extent of CNV, FFA remains superior for detecting active leakage. OCTA does not assess disc pallor.
Reference: Khurana Comprehensive Ophthalmology, 7th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.