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Digital fundus photos. The outer ring centered on the fovea is 1DD in size. The inner ring centered on the fovea is 500 microns in size. (A) 450 image showing HE located further than 500 microns away from the center of the macula but within 1DD. HE are present in 2 out of 8 sectors within the central zone (CZ; within 1DD). (B) An enlarged image of the macula. HE are located within 500 microns from the center of the macula and in 5 out of 8 sectors within the CZ.
