Furthermore, research has been conducted on eye diseases in patients with BD, with the following results: HLA‐A26 carriers had a higher risk of iridocyclitis and retinal chorionitis, especially in men; the frequency of HLA‐A*2601 in patients (37.5%) was significantly higher than that in the control group (14.4%)43; and HLA‐A*2601 was considered a possible marker for the prognosis of poor vision.42 Here, HLA-A is linked to iridocyclitis.