Neovascularization | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
NVI | NV at pupillary zone < 2 quadrant | NV at pupillary zone > 2 quadrant | NV at ciliary zone/ectropion uveae 1 - 3 quadrant | NV at pupillary zone > 3 quadrant |
NVA | NV cross SS and branches over TM < 2 quadrant | Angle vessels cross SS and branches over TM > 2 quadrant | NV at TM PAS 1 - 3 quadrant | NV at TM PAS > 3 quadrant |