On OCT angiography (OCTA), the normal foveal avascular zone (FAZ) in healthy adults has an average diameter of approximately:
- A 1500 micrometers
- B 1000 micrometers
- C 500 micrometers ✓
- D 200 micrometers
Correct answer: C. 500 micrometers
Explanation
The normal foveal avascular zone in healthy adults measures approximately 400-600 micrometers in diameter, with an average of about 500 micrometers. An enlarged FAZ is a key finding in diabetic macular ischemia. 200 micrometers (option D) is too small, while 1000 micrometers (option B) indicates pathological enlargement.
Reference: OCT Angiography in Retinal and Macular Diseases, 1st ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.