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Meiboscore grading (Jenvis classification) at Keratograph examination: the loss of meibomian glands is graded from 0 to 3.
| Grade 0 | No loss of meibomian glands |
| Grande 1 | Loss of less than 1/3 of the total meibomian gland area |
| Grade 2 | Loss of 1/3 to 2/3 of the total area |
| Grade 3 | Loss of more than 2/3 of the area |
