Table 1. Morphological criteria for patients treated with laser posterior to the neovascular ridge for severe ROP in this series.

Proposed morphological criteria for posterior laser
Primary laser	Secondary laser (>2 weeks from primary laser)
•thick stage 3 neovascular ridge in four confluent temporal clock hours	•persistent plus disease in two temporal quadrants
•sub-retinal fluid associated with neovascular ridge	•persistent or worsening of thick, stage 3 neovascular ridge in four confluent clock hours
•plus disease in temporal two quadrants	•minimal temporal retinal traction
•minimal temporal retinal traction	•minimum of 3000 μm between fovea and temporal ridge
•minimum of 3000 μm between fovea and temporal ridge