The lenses come in amber for sports like baseball and tennis where the wearer
must separate fast moving objects from the background, and grey-green for sports
like golf, where the background environment is what’s visually important. Both
colors filter out a significant amount of overall light, but they also sharpen
and improve contrast, so they have a brightening effect, says Alan Reichow, who
invented the lenses and is a sports vision consultant for Nike.
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."
Wired News: Sharper Image, Better Performance