It may be a validity estimate system of rebuilding ocular surface to analyze framework and configuration of the ocular surface and test the tear film breakup time.

Observed tarsal gland, tarsal gland massage with or without abnormal secretions from the mouth overflow gland, tear film breakup time (BUT), whether symptoms improve or disappear.

And not only is the initial breakup not as crushing as we expect, but the recovery time is also much quicker than we might imagine.