Table 1.

The graduation standard of MGD

Degree	Symptoms	Palpebral margin changes	Secretion character score	Secretion discharge capacity score	Meibomian gland deletion score	Corneal
Mild	Slight, intermittent	Normal or mild hyperemia of palpebral margin and there may be fat cap formation	1	1	1	Normal, no epithelial damage
Moderate	Mild or moderate, persistent	palpebral margin becomes blunt, round and thickened. Meibomian gland mouth was obstruction and protuberance	2	2	2	Mild or moderate epithelial damage, located at the periphery
Severe	Moderate or severe, affecting life or work	The blepharon margin is thickened and the neovascularization is obvious. Fat thrombus formation in meibomian gland mouth	3	3	3	Damage to epithelium and superficial matrix