Before you can get your contact lenses, you will need to go to your optometrist for a professional eye exam. This test will give your optometrist the information they need to identify your contact lens prescription, which is vital for ensuring you get the right lenses for your eyes.
The ‘BC’ or base curve measurement indicates the back curvature of your contact lens, in millimetres. This is important for comfort, as the BC of your contact lenses should match your eye’s natural curve as closely as possible to ensure a better fit when you are wearing your contact lenses. It also means your contact lenses will be less likely to fall out. A lower BC number means a steeper curve of your cornea (the clear front surface of your eye). A higher BC number means your cornea is flatter.