There are approximately 60 diseases that can cause uveitis, which can originate from lesions in the eye itself or from systemic diseases, both infectious and non-infectious. Infectious uveitis is caused by pathogenic infections; non-infectious uveitis is mostly due to autoimmune diseases. Common causes: 1. bacterial, viral, fungal or parasitic infections; 2. immune-related diseases such as rheumatoid arthritis, psoriasis, ankylosing spondylitis, Reiters disease, etc.; 3. severe ocular trauma; 4. some cases of unknown cause.