Bullseye/point blanc

Which brings up a point. I have never seen a target with a white bullseye. Visually, a white bullseye would be harder to focus on than a black one because the eye is attracted to the darker colour. Your eye would be drawn away from a white bullseye surrounded by a black circle.

Maybe I'm way off mark (ha) but, because of this, the first explanation just does not seem right.