Skip to main content
. 2016 Feb 10;11(2):e0148183. doi: 10.1371/journal.pone.0148183

Fig 1. Early Treatment Diabetic Retinopathy Study (ETDRS) chart of the right (R) and left (L) eyes.

Fig 1

The ETDRS plot is centered at the fovea. It includes three circles with diameters of 1 mm, 3 mm and 6 mm. The area is further divided into four quadrants: superior, inferior, nasal and temporal. Cen, central subfield; Sin, Superior inner ring; Nin, Nasal inner ring; Iin, Inferior inner ring; Tin, Temporal inner ring; Sout, Superior outer ring; Nout, Nasal outer ring; Iout, Inferior outer ring; Tout, Temporal outer ring.