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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