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1.      Flat demarcation line separating the vascular from the avascular peripheral
retina.
2.      The demarcation line is ridged/elevated.
3.      Fibrovascular proliferation or neovascularization along the demarcation
line.
4.      Partial retinal detachment, further defined by Stage 4A and Stage 4B:
a.      Macula on
b.      Macula off
5.      Total retinal detachment.
·        Plus Disease: Any ROP with at least two quadrants of engorged/tortuous
vasculature.