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Grading of clinical signs
| Sign | Grade 0 | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|---|
| Conjunctival redness | none | pink | light red | bright red |
| Lid margin debris | none | 1–5 crusts | 6–10 crusts | >10 crusts |
| Lid margin redness | none | pink | light red | bright red |
| MG expression | touch | light pressure | moderate pressure | occluded |
| MG secretion | clear | turbid | turbid with clumps | solid paste |
| MG plugging | Number of plugged orifices within the central 10 glands of lower lid | |||
| TBUT | Number of seconds to first breakup following complete blink | |||
