To confirm the diagnosis, the medical history, signs and tests usually need to be combined. Doctors will use a slit lamp to look at eye details, measure intraocular pressure, do blood tests (like antinuclear antibodies, HLA typing), and if necessary do imaging or other specialty consultations. The goal is to neither miss nor misdiagnose; after finding the cause, treatment can be more directed. Remember, diagnosis is a comprehensive process, not a casual conclusion.