Almost all the best cycling sunglasses have quite big lenses. This is because the bigger the lenses are, the more protection they offer you. In addition to that, these bigger lenses provide you with a larger field of vision. Hence, you will be able to see a lot more without being restricted by the frame. This is important when you are cycling at high speeds, as it means you are more aware of what is going on around you. You will be able to see more and have a clearer vision.