You should have an eye test every two years if you are an adult with no specific eye problems or risks. However, if you notice any changes in your vision or if your optometrist recommends more frequent check-ups, you should have eye tests more often. For children, yearly exams are advised, and for older adults—especially those over 65—annual eye tests are usually recommended to monitor eye health closely. People with conditions like diabetes may need yearly exams as well. Regular eye tests are important not only to update prescriptions but also to detect eye diseases and other health conditions early, even if no symptoms are present.