Topographic variations of choroidal thickness on swept-source OCT in healthy eyes
A.Gaudric, S.Touhami, E.Philppakis
Université Paris 7 Diderot Hôpital Lariboisière , Paris, France
Purpose: to the study the topography of choroidal thickness variations on Choroidal thickness maps obtained by wide-field swept-source OCT.
Methods: We examined 38 eyes (mean axial length: 24.1mm) from 2O patients (mean age: 35) with Swept-source OCT ( Triton, Topcon, Japan) using a 12 radial high-resolution B-scan choroidal thickness map.
Results: Choroid was thinner nasally than temporally. Choroidal maps showed that the maximum choroidal thickness was not retrofoveal but most often in the temporo- superior part of the central area. Choroidal thickness did not homogeneously decrease from the center to periphery. Instead, we observed different patterns of physiological choroidal thickening. The more frequent was a temporal wing of thickening (56.2%) either predominant in the superior quadrant (25%) in the inferior quadrant (18.7%) or affecting both (12.5%) equally. Hourglass pattern was present in 28.2%, and a uniform thickness accounted for the remaining 15.6%. This choroidal thickness distribution was parallel to this of choroidal veins in the posterior pole. Mean choroidal thickness was higher in the temporal wing pattern that in the hourglass pattern.
Conclusion: Choroidal thickness does not decrease uniformly from the posterior pole to the mid-periphery. The topography or areas of choroidal thickening varies with the pattern of choroidal veins. These findings should be taken into account in interpreting pathological cases such as central serous choroidopathy or pathologic myopia.