Figure 4: Choroidal thickness map of a healthy 9-year-old girl obtained by SS-OCT.
From: Choroidal Thickness in 3001 Chinese Children Aged 6 to 19 Years Using Swept-Source OCT

(a) Choroidal thickness, measured as the distance between the Bruch membrane and the choroid-sclera interface, horizontally (a) and vertically (b). (c) The ETDRS grid was applied to the map, and the mean choroidal thickness was obtained for each sector.