Fig 5. Correlations between vessel density (VD) and retinal thickness.

Scatter-plots with solid line showing the relationships between the parafoveal vessel density (VD, %; y axis) and the retinal thickness (micron; x axis) in healthy subjects (A,C) and in diabetic retinopathy (DR) patients (B,D). A and B: significant correlations (all p <0.01) were observed between the VD in the superficial vascular plexus (SVP) and the inner retinal thickness (from the inner limiting membrane, ILM, to the border between the inner plexiform layer, IPL, and the inner nuclear layer, INL) in both healthy subjects (A) and DR (B) patients. C and D: no correlations were observed between the VD in the deep vascular complex (DVC) and the intermediate retinal thickness (including the INL and the outer plexiform layer) in both healthy subjects (C) and DR (D) patients. r = Pearson correlation coefficient.