Assessment of the Dynamic Alteration of Choriocapillaris Vessel Density after Focal Laser Photocoagulation with OCT Angiography

Figure 3

Multimodal imaging shows the laser lesions at different times in group B. The top horizontal row shows the fundus feature before laser treatment. The images from the second horizontal row to the fifth horizontal row show the laser lesions at different times, respectively. The first column is the fundus photograph taken with the Optomap® camera. The second column is the choriocapillaris layer of the OCTA images shown in the red frame of the first column, which reveals an obvious decrease in the choriocapillaris flow beneath the laser lesions at one hour and one day after laser treatment, whereas an obvious recovery is observed at one week and an almost complete recovery at one month after treatment. The third column is the OCT B-scan of the laser lesion circled in red in the second column, which shows a hyperreflective column-like area in the outer retinal layer at one hour and one day after laser treatment, and afterwards, the hyperreflective signal disappears, with a focal thickening of the RPE at one week and one month after treatment. The fourth column is the amplified view of the laser lesion circled in red in the second column. The fifth column is the black and white pixel image of the laser lesion after binarization.