Orthoptists diagnose and treat eye issues, particularly those involving eye movement and how the eyes work together to focus, a condition known as binocularity. Patients of any age can visit an orthoptist, although due to the developmental nature of many binocular abnormalities, children make up the majority of their patients. Color vision, visual acuity, and the rate of motor development related to vision development are all tested and measured by orthoptists. Orthoptists may refer patients to ocular surgeons and other physicians after interpreting test findings, or they may undertake nonsurgical therapies such as corrective lenses, patches, drops, exercises, and more. The vast majority of orthoptists are full-time employees. They work at hospitals, clinics, private offices, and university-affiliated medical facilities, as well as visiting schools to administer tests. Orthoptists may also lecture or do clinical research. Following a bachelor's degree in a scientific or health care major, orthoptists must complete a 2-year training fellowship. As part of their clinical studies, orthoptist students often analyse at least 1500 individuals. After completing their training, students must pass the American Association of Certified Orthoptists' certifying examination.