What should be done if colors cannot be determined during a vision test?

When a vision test reveals that colors cannot be determined, further testing is necessary to ensure the individual meets the required standards for color vision. Color perception is crucial for various driving tasks, as it impacts the ability to recognize signals, signs, and the color of vehicles and other important visual cues on the road.

If colors cannot be distinguished, the medical examiner must assess whether this limitation can be addressed through additional testing or if it indicates a more significant issue that could impair driving abilities. Thus, further testing is essential to obtain a clearer understanding of the individual's vision capabilities. This approach ensures that all drivers are adequately evaluated for their ability to safely operate a commercial vehicle.