Abridged classification of eye changes of Graves' disease
| Class | Definition |
|---|---|
| 0 | No physical signs or symptoms |
| 1 | Only signs, no symptoms (signs limited to upper eyelid retraction, stare, and eyelid lag) |
| 2 | Soft tissue involvement (symptoms and signs) |
| 3 | Proptosis |
| 4 | Extraocular muscle involvement |
| 5 | Corneal involvement |
| 6 | Sight loss (optic nerve involvement) |