The CASA Medical Examination is a health assessment required by the Civil Aviation Safety Authority (CASA) for pilots and air traffic controllers to ensure they meet medical standards for safe aviation. There are three certificate classes: Class 1 for commercial pilots, Class 2 for private pilots, and Class 3 for air traffic controllers. The process involves applying online, booking an exam with a CASA-approved medical examiner, and undergoing tests like health history review, physical exam, vision, and hearing tests. Additional tests, such as ECGs, may be required for some classes. Certificates must be renewed periodically, and any health changes must be reported to CASA.