The Longitudinal Study of Ocular Complications of AIDS (LSOCA) is prospective observational study of patients with AIDS. Patients with a prior diagnosis of AIDS according to the 1993 Centers for Disease Control and Prevention (CDC) criteria with or without ocular complications will be enrolled over a 4 year period. Approximately 2,000 patients will be enrolled in the study. Enrollment of patients with CMV retinitis at baseline will be between 300 and 600 patients. Followup visits for patients without ocular complications will be scheduled every 6 months. Followup visits for patients with ocular complications at baseline or diagnosed during followup will be every 3 months. Followup data will include eye examinations, fundus photographs, visual function testing, medical history, hematology and serum chemistry, and collection of plasma and blood cells for banking. Analysis of banked specimens will include HIV RNA levels and CMV DNA levels.