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Grading of clinical symptoms (as used in Figure 1)
| Symptom | Grade 0 | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|---|
| Itching | none | awareness | desire to rub | frequent rub |
| FBS* | none | awareness | desire to rub | desire to close lid |
| Dryness | none | awareness | need for drop | frequent drops |
| Burning | none | awareness | need to rub | frequent rub |
| Swelling | none | noticeable | obvious | decrease in aperture |
FBS= foreign body sensation
