Type 1 ROP (stage 3, zone II) treated with peripheral laser photocoagulation. A, Color fundus photograph shows the long posterior ciliary nerve (arrowheads) and flat neovascularization in posterior zone II temporally (arrows), which is identified definitively by the areas of leakage on the corresponding fluorescein angiogram (B). C, Color photograph taken immediately after laser treatment. Note that treatment abuts the ridge and is intentionally more sparse in the region of the long posterior ciliary nerve (arrowheads) to minimize damage to the nerve.