Retinopathy
of Prematurity
Zone 1 |
Circle centered on nerve with radius twice
the distance from nerve to fovea |
Zone 2 |
Circle extending to ora serrata nasally |
Zone 3 |
Temporal crescent extending to ora serrata
temporally |
Stage
Stage 0 |
Immature vascularization, no ROP |
Stage 1 |
Demarcation line |
Stage 2 |
Ridge |
Stage 3 |
Extraretinal fibrovascular proliferation |
Stage 4 |
Partial retinal detachment |
Stage 5 |
Total retinal detachment |
Plus
Disease
Plus disease |
– At least 2 quadrants of venous dilation
and tortuosity |
Pre-plus disease |
Abnormal dilation and tortuosity not
sufficient to meet plus criteria |
Threshold disease |
5 contiguous or 8 non-contiguous clock hours
of extraretinal neovascularization in zone 1 or zone 2 with plus disease |
Aggressive posterior ROP (rush disease) |
Posterior location, prominence of plus
disease, ill-defined nature of retinopathy |
ETROP
Classification
Type 1 ROP |
Zone I, any stage with plus disease |
Type 2 ROP |
Zone I, stage 1 or 2 without plus disease |
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