Meibomian gland dysfunction (MGD) causes evaporative dry eye. The International Workshop on MGD formally defined it as a chronic, diffuse abnormality of the meibomian glands, commonly characterized by terminal duct obstruction and/or qualitative/quantitative changes in glandular secretion. It may result in alteration of the tear film, eye irritation symptoms, clinically apparent inflammation and ocular surface disease.
With the recent development of non-contact meibographic methods that use infrared light, images of the meibomian gland structures and their morphological changes in the upper and lower eyelids can be obtained non-invasively. This helps identify differences in meibomian gland structure in subjects with DED symptoms. The aim of this project is to update MGD classification the basis of meibomian gland structure as revealed by infrared meibography.