Sport contact lenses, in red, or gray-green, for enhanced visual performance :
The amber lenses also turn the wearer’s eye’s an unsettling shade of red. But when Nike asked players if they’d like to create a version that created less of an evil eye, the answer was an overwhelming “no.”
“They felt it gave them a more intimidating look,” Reichow said, “and thus an edge over the competition.”
(quoted from the wired.com article)
I’d like a pair of those one day, evil looking 😉