Fig. 1
From: Change in subfoveal choroidal thickness in diabetes and in various grades of diabetic retinopathy
a Enhanced depth imaging-optical coherence tomography (EDI-OCT) image of the right eye of a 64 years old male subject with no diabetes, showing a well delineated layer of choroid with a clear demarcation of its outer limit (arrows), and a subfoveal choroidal thickness of 251 µm. b EDI-OCT image of the left eye of a 66 years old male diabetic subject with severe non-proliferative diabetic retinopathy, having a comparatively lower subfoveal choroidal thickness of 226 µm (outer limit of choroid labelled with arrows)