Eyes don’t usually let you know that something is wrong. Any change is usually very gradual, so you become accustomed to the change in your vision. Therefore, regular eye tests are important to pick up any change as soon as possible to make sure any problem can be treated before it affects vision. The eye test detects many conditions earlier than waiting for symptoms to appear. The eye test does not only check whether you need glasses, but it can show a number of underlying health problems, such as diabetes and glaucoma, and the general condition of your eyes.