“…The relationship between RA and DED or corneal surface damages is still not fully clarified due to some methodological limitations of previous studies, including a small sample size ( n < 1000) [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ], insufficient adjustment for confounders [ 17 , 18 , 19 , 20 , 22 , 23 ], and restriction to specific medical institutions [ 17 , 18 , 19 , 21 , 22 , 23 ] or populations [ 19 , 20 ]. Furthermore, relevant risk factors for corneal surface damage among patients with RA remain largely unknown.…”