Staging
ROP stage
The grading of retinopathy of prematurity by the appearance of the junction between vascularized and avascular retina, from a flat line to total retinal detachment.
Also called: stage
Stages
- 1
Demarcation line
A flat demarcation line separates vascularized retina from the avascular periphery.
- 2
Ridge
The line has thickened into a raised ridge at the junction.
- 3
Extraretinal fibrovascular proliferation
New vessels and fibrous tissue grow from the ridge into the vitreous.
- 4
Partial retinal detachment
The retina is partly detached from the wall.
Sub-stages
- 4A
- Detachment sparing the macula.
- 4B
- Detachment involving the macula.
- 5
Total retinal detachment
The retina is completely detached.
Judged onThe appearance of the junction between vascularized and avascular retina on retinal examination