Fig. 2From: Topical citicoline and vitamin B12 versus placebo in the treatment of diabetes-related corneal nerve damage: a randomized double-blind controlled trialChanges of the frequency of stages of the Ocular Surface Disease Index at baseline vs month 18 in the two groups (Cit-B12, P = 0.05). Normal, OSDI = 12 or less; mild, OSDI between 13 and 22; moderate, OSDI between 23 and 32Back to article page