Version May 2024
| Stage 0: Normal optic disc or not a disc but no edema/swelling |
| A. Prominence of the retinal nerve fiber layer at the nasal, superior, and inferior poles in inverse proportion to disc diameter |
| B. Radial nerve fiber layer striations, without tortuosity |
| Stage I: Minimal |
| A. C-shaped halo that is subtle and grayish with a temporal gap; obscures underlying retinal details |
| B. Disruption of normal radial nerve fiber layer arrangement striations |
| C. Temporal disc margin normal |
| Stage II: Low degree |
| A. Circumferential halo |
| B. Elevation – nasal border |
| C. No major vessel obscuration |
| Stage III: Moderate |
| A. Obscuration of 1 or more segments of major blood vessels leaving disc |
| B. Circumferential halo |
| C. Elevation – all borders |
| D. Halo – irregular outer fringe with finger-like extensions |
| Stage IV: Marked |
| A. Total obscuration on the disc of a segment of a major blood vessel on the disc |
| B. Elevation – whole nerve head, including the cup |
| C. Border obscuration – complete |
| D. Halo – complete |
| Stage V: Severe |
| A. Partial obscuration of all vessels on disc and total obscuration of at least 1 vessel on disc |
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