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The grading system for OSD severity.
| The severity of ocular surface disorder | |
|---|---|
| Grade 0 | No exposure keratopathy |
| Grade I | Punctate epithelial erosions (PEEs) involving the inferior third of the cornea |
| Grade II | PEEs involving more than the inferior third of the corneal surface |
| Grade III | Macroepithelial defect (MED) |
| Grade IV | Stromal whitening in the presence of epithelial defect (SWED) |
| Grade V | Stromal scar |
| Grade VI | Microbial keratitis |
