TGFB1 and Keratoconjunctivitis sicca: The results of Chen Yanya's study indicated that the expression rate of TGFβ1 in conjunctival epithelial cells was different in patients with different degrees of dry eyes and positively correlated with conjunctival Lisamine green staining score, corneal fluorescein sodium staining score, and dry eye questionnaire score, and negatively correlated with TBUT and tear secretion test, that is, the higher the expression of TGFβ1, the higher the degree of xerophthalmia [40–43].