Which one?

[ACav]

They say that 20% of American males have some level of red-green colorblindness and the VA ophthalmologist  that I see says that is about right for his male patients in Arizona. Of course, most of his patients are over 65, but I don't think that it is an age-related disability.

In MLB baseball, they figure that at least 10% of male MLB players have a range of red/green colorblindness.  The pitching pros say that it makes a difference in hitter's perception of thrown pitches.

Is it a curve, a slider, a sinker or a fast ball? Split second decisionmaking, is usually tied to a lot of factors, that include how those red stitches on the ball look to you.