NVI and NVA grade by Weiss and Gold classification

NVI (Neovascularization of Iris) and NVA  (Neovascularization of angle) grade by Weiss and Gold classification ,1978

which distinguish four stages of neovascularization, according to the area of new vessels in the iris, anterior chamber angle, and the location of PAS...

NVI grading is as follows

grade 1, fine surface neovascularization of the pupillary zone of the iris, involving ≤2 quadrants; 

grade 2, surface neovascularization of the pupillary zone of the iris, involving ≥2 quadrants; 

grade 3, in addition to the pupillary zone, neovascularization of the ciliary zone of the iris and/or ectropion uveae involving 1 to 3 quadrants; 

grade 4, neovascularization of the ciliary zone of the iris and/or ectropion uveae involving ≥3 quadrants. 

NVA grading is as follows:

 grade 1, fine neovascular twigs cross scleral spur and ramify on trabecular meshwork, involving ≤2 quadrants; 

grade 2, neovascular twigs cross scleral spur and ramify on trabecular meshwork, involving ≥2 quadrants; 

grade 3, in addition to the trabecular meshwork, PAS involving 1 to 3 quadrants; 

grade 4, PAS involving ≥3 quadrants.

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