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Efron Grading Scale for the evaluation of corneal staining
| Grade | Extent of corneal staining |
|---|---|
| 0 | None: Clear cornea, no staining |
| 1 | Trace: Light punctuate staining |
| 2 | Mild: More light punctuate staining |
| 3 | Moderate: Pan-corneal punctuate staining |
| 4 | Severe: Heavy pan-corneal punctuate staining |
