Dark Signals in the Choroidal Vasculature on Optical Coherence Tomography Angiography: An Artefact or Not?

Figure 3

Increased and decreased signals in the choroidal capillaries seen on OCTA. Corresponding en face images for (a) OCTA and (b) SS-OCT. The dark area on the left in (a) and (b) indicates that the velocity of blood flow in the choriocapillaris is slow in the region of choroidal atrophy, compared with that in the bright area. OCTA: optical coherence tomography angiography; SS-OCT: swept-source optical coherence tomography.

(a)

(b)