Table 1.

Grading systems for neovascularization of the iris and neovascularization of the angle [12]

Grade	Neovascularization of iris	Neovascularization of angle
0	No iris neovascularization	No angle neovascularization
1	Fine surface neovascularization of the pupillary zone of the iris involving less than 2 quadrants	Fine neovascular twigs crossing the scleral spur and ramifying on the trabecular meshwork involving less than 2 quadrants
2	Surface neovascularization of the pupillary zone of the iris involving more than 2 quadrants	Neovascular twigs crossing the scleral spur and ramifying on the trabecular meshwork involving more than 2 quadrants
3	In addition to neovascularization of the pupillary zone, neovascularization of the ciliary zone of the iris and/or ectropion uveae involving 1–3 quadrants	In addition to neovascularization of the trabecular meshwork, peripheral anterior synechiae (PAS) involving 1–3 quadrants
4	In addition to neovascularization of the pupillary zone, neovascularization of the ciliary zone of the iris and/or ectropion uveae involving more than 3 quadrants	In addition to neovascularization of the trabecular meshwork, PAS involving more than 3 quadrants