Figure 2.

SCP and VD illustrating the effect of ND filters on macular OCTA image acquisition. (A) SCP in different OD. The VD of SCP is divided by an ETDRS grid includes parafovea (the annulus area between the two white circles) that contains four regions (inner superior, nasal, inferior, and temporal). The diameter of small white and big white circles is 1.0 mm and 3.0 mm in Cirrus OCTA (2.5 mm in Triton OCTA), respectively. (B) Scatter plots and correlation between OD and each region of parafoveal VD in SCP. Each point from one participant. The r_s and P values were shown (n = 22). SCP, superficial capillaries plexus; VD, vessel density; OD, optical density; ETDRS, early treatment diabetic retinopathy study; r_s, Spearman correlation coefficient.