Table 1.

Staging of NVI by OCTA imaging (modified from the established clinical staging system by Gartner and Henkind).

Stage	Clinical and OCTA characteristics
1	Fine, thin-walled irregular vessels at the pupillary border and at the iris root.
2	Thin-walled vessels located around the pupillary border and at the iris root enlarge and penetrate to the anterior iris surface. New vessels also develop in the iris stroma.
3	Merging of the two sets of NVI (peripupillary and anterior chamber angle). NVI with connective tissue support covers parts of the anterior surface of the iris. Peripheral anterior synechiae can develop.
4	Regressed NVI after treatment. Clinically invisible, fine, irregular vessels detected by OCTA.

Abbreviations. NVI = neovascularization of the iris; OCTA = optical coherence tomographic angiography.