The Early Treatment Diabetic Retinopathy Study (ETDRS) map (6x6 millimeters) of the whole retinal, outer retinal and choroidal thicknesses in normal subjects.

<p>The ETDRS map is divided into nine parts (1-millimeter-diameter circle at the center, four inner-quarter annuluses between the 1- and 3-millimeter-diameter circles, and four outer-quarter annuluses between the 3- and 6-millimeter diameter circles). <b>A, B, and C:</b> All data are expressed as the mean thickness ± standard deviation of the whole retina, outer retina and choroid, respectively.