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. Author manuscript; available in PMC: 2015 Oct 5.
Published in final edited form as: Neonatology. 2014 Oct 5;106(3):254–260. doi: 10.1159/000365132

Figure 2.

Figure 2

Retinal zones used for grading of ROP. Zone I describes a circle around the optic nerve head (ONH) with a radius of twice the distance from ONH to fovea. Zone II is a circle around the ONH reaching the nasal periphery (at the 3 o’clock position in the image). Zone III is the remaining temporal crescent-shaped retina. Image reproduced with permission from [6].