Meibomian Gland Dysfunction or MGD causes by meibomian gland obstruction or the abnormal which occurred on meibomian gland in. The production of lipid layer is decrease due to MGD, the result of a rapid evaporation of tear film than usual. Finally, Dry Eye disease happen. 
 
Nowadays, There are many solutions for treatments:

• Using the artificial tear with high amout of lipid.
• Eye lid Spa and warm expression
• Meibomian Gland Expression
• Intense Pulsed Light or IPL, the extensively technology, IPL can reduce the inflammation and restore function of Maiblmian Gland

Intense Pulsed Light with Dry Eye treatment has been approved in the international society like TFOS (Tear Film & Ocular Surface Society) as the second step standard treatment.

The Video as below link explain MGD and mechanism of IPL treatment.
https://drive.google.com/file/d/1-7-6hqEMXRNrAhdfjhdeNUP-cy-qNKay/view?usp=sharing
 
Reference : https://www.bangkokhospital.com/content/meibomian-gland-dysfunction , https://www.tfosdewreport.org