Fig. 4.

OCT angiography and en face image with swept-source (SS) OCT images and RPE elevation map. A, B: OCT angiography (A) and en face image (B) centered on the fovea (12 × 12 mm) of the choriocapillaris slab. A portion of the dilated choroidal vessels can be seen. Inset, B-scan targeting of the RPE elevation indicated by red line showing blood flow (red dots) beneath the RPE. The en face image (B) shows some drusen (black arrows) along the branches of the dilated choroidal veins. The yellow arrow is described below. C: SS-OCT image scanned horizontally around the exit site (yellow arrow in Fig. 4A), showing the course (yellow arrowheads) of the dilated choroidal vein within the choroid after they converged as running nasally and then turning towards the sclera. The sclera is not observed because of the relatively thick choroid. Double pink lines indicate the upper offset 29 μm and lower offset 49 μm from the RPE reference which are based on the choriocapillaris slab. D: The RPE elevation map made by Macula Cube analysis, showing that the RPE elevations correspond to the course of the trunk of the dilated choroidal veins in the macular area. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)