This is test is different from your sight test. Your lenses are a foreign body on your eye. Although they are very good, they still can cause unwanted changes to your eyes, which may lead to long-term damages, infections and intolerance to contact lenses. This test is focused on measuring the curvature of your cornea, examine the external of your eyes to find any complications that will make the wearing of contact lenses uncomfortable for you. This test also assesses the quality of your tears and cornea surface. Whether you are a daily or monthly contact lens wearer or purchase your lenses online, this is an essential test for you.