| Grade 0 | No blood present in the vitreous, the entire retina is visible. |
|---|---|
| Grade 1 | Some hemorrhage present, which obscures between a total of 1 to 5 clock hours of retina. Laser photocoagulation (PRP) can be successfully performed. |
| Grade 2 | Hemorrhage obscures between a total of 5 to 10 clock hours of central and/or peripheral retina, or a large hemorrhage is located posterior to the equator, with varying clock hours of anterior retina visible. Laser is feasible, but a full PRP can not be placed. |
| Grade 3 | A red reflex is present, with no retinal detail seen posterior to the equator, precluding any photocoagulation. |
| Grade 4 | Dense vitreous hemorrhage with no red reflex present. |