You should regularly check your helmet visor. Why should you replace it if it is scratched?

You answered correctly. A scratched helmet visor should be replaced because scratches can cause light to scatter, resulting in dazzling effects at night, and they can also restrict your vision, making it harder to see clearly. Both of these issues are safety hazards. The rule exists to ensure that you always have a clear and undistorted view while riding, especially in low-light or night conditions. The answer about your face being identifiable is not a reason to replace a scratched visor. Remember, good visibility is crucial for safe driving or riding at all times.