The "easiest" test is subjective, but many pilots with mild color vision deficiencies find the OPTEC 2000 or 900 series (Vision Testers) or the Richmond (AO-HRR) plates to be more forgiving than the standard Ishihara "numbers in circles" test. In 2026, the FAA has shifted toward more modern, computer-based screenings like the Waggoner Computerized Color Vision Test (WCCVT) and the Rabin Cone Contrast Test (RCCT). These are designed to be more objective and can often distinguish between a safe "color-safe" pilot and one with a significant deficiency. If a pilot fails the initial screening at an Aviation Medical Examiner (AME), the definitive "easiest" route to keep a medical certificate is often the Signal Light Gun Test at an airport. This is a practical, real-world test where a pilot simply identifies red, green, and white lights from an ATC tower, which, once passed, can grant a permanent waiver (SODA) for color vision.