Firstly, ankylosing spondylitis is a chronic autoimmune disease that primarily affects the axial joints. Its most common clinical manifestations are a stiffness in the neck or pain in the lumbar and back areas. This pain often occurs after sitting for a long time or at night, and symptoms are relieved after standing up and moving around; these are the main joint symptoms. In addition to these, there can also be extra-articular manifestations, with the most common being uveitis or iritis, which occur repeatedly. Some individuals may even develop corneal ulcers, also known in layman's terms as experiencing "red eye." These are extra-articular symptoms. Once recurrent uveitis or iritis occurs, aside from considering eye-related issues, systemic diseases must also be considered. Following the onset of this type of uveitis, the first choice of treatment is biologics.