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  Indian J Med Microbiol
 

Figure 1: Map diameters centered on fovea (left) and nine standard early treatment diabetic retinopathy study regions (right). The macula is divided into nine regions with three concentric rings measuring 1 mm (innermost ring), 3 mm (inner ring) and 6 mm in diameter (outer ring) centered on the fovea with inner and outer ring being divided into four quadrants each

Figure 1: Map diameters centered on fovea (left) and nine standard early treatment diabetic retinopathy study regions (right). The macula is divided into nine regions with three concentric rings measuring 1 mm (innermost ring), 3 mm (inner ring) and 6 mm in diameter (outer ring) centered on the fovea with inner and outer ring being divided into four quadrants each