MUC5AC and glaucoma: A previous study [10] showed that failed glaucoma surgeries featured lower MUC5AC levels (MUC5AC, a goblet cell-derived gel-forming mucin, plays a vital role in maintaining tear film stability [11]) and higher HLA-DR levels (HLA-DR, the most abundant inflammatory biomarker on the ocular surface, is overexpressed in DED and may thus serve as a method for classifying DED severity and evaluating treatment responsiveness [12]) than successful surgeries.