This document discusses the ocular manifestations of various systemic diseases. It begins by outlining the objectives of understanding the eye signs of systemic illnesses and the importance of early detection. It then covers common diseases that can affect the eye, including autoimmune disorders like rheumatoid arthritis and systemic lupus erythematosus, hematological abnormalities, infectious diseases, endocrine disorders like diabetes and thyroid eye disease, muscular disorders, and inherited conditions such as Marfan syndrome. For each condition, the document details the potential ocular signs and symptoms, highlighting the links between ocular health and overall physical well-being.