According to the search results, yellow and orange are the easiest colors for human eyes to see. Yellow is statistically the easiest color to see overall, and players can follow a colored golf ball in flight almost 50 percent better than a white golf ball on 200-yard drives. However, the ease of finding a golf ball on the ground depends on the background and lighting conditions. Green, pink, and orange are also considered to be highly visible colors. White is an excellent all-around color that is ideal for almost all golfing conditions, but it may not be as easy to spot as colored balls. Red and blue golf balls are generally not recommended as they can be difficult to see. In conclusion, yellow and orange are the easiest colors to see, but the ease of finding a golf ball on the ground depends on the background and lighting conditions.