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In this review, the importance of Japanese research on meibomian gland dysfunction (MGD) is discussed from the perspective of global academic and clinical research on this topic. Many Japanese physicians and researchers have contributed to recent worldwide progress in various fields of MGD research, including pathophysiology, epidemiology, diagnosis, and therapy. In Japan, recent studies in the field of pathophysiology have provided direct evidence for the hypothesis that lipid composition and reactive oxygen species play a crucial role in the development and worsening of MGD. In the field of diagnosis, slit-lamp examination, in vivo confocal microscopy, and meibography have been widely used in studies from Japan. On the basis of the results of these studies, the MGD working group in Japan has proposed new diagnostic criteria for obstructive MGD. According to these criteria, obstructive MGD is considered present when ocular symptoms, anatomic abnormalities, and meibomian gland obstruction are present. In the field of therapy, devices and drugs newly developed in Japan have been shown to enhance the efficacy of lid hygiene and warm compression. Moreover, diquafosol and vitamin D3 have been shown to be effective for MGD. In conclusion, standardization of the diagnosis and treatment of MGD is necessary to enable all patients with MGD to receive appropriate treatment, and specific diagnostic criteria with cutoff values for each parameter are necessary to standardize the diagnosis of MGD.

Meibomian Gland Dysfunction: Recent Progress Worldwide and in Japan