Eyes wearing Nikes

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Eyes may be the windows of the soul, but with Nike's much-touted MaxSight contact lens, the only view many athletes' opponents will get is an intimidating crimson stare.

The contact lens, created by Nike Inc. and Bausch & Lomb, is the latest in athletic eye care. Many, however, ask whether the lenses live up to Nike's hype or if MaxSight is more flash than substance.

Though the prescription-only lenses' red or gray-green sheen gives athletes an intimidating -- even disconcerting -- gaze, this predatory edge is just a fringe benefit. The main purpose of the MaxSight, says Bausch & Lomb representative Tor Constantino, is to "selectively [filter] specific wavelengths in light to visually enhance key elements in sport."

The MaxSight is designed to overcome the main source of blurred vision in bright locales: chromatic aberration, the eye's inability to focus all frequencies of the visible spectrum onto one point of the retina. By filtering 95 percent of blue and UV light, the MaxSight reduces glare and allows the eye to focus on smaller wavelengths with sharper contrast.

The color of the lens is tailor-made for certain sports. The amber lens, used for sports with fast-moving balls such as baseball and tennis, augments colors in the blue-green spectrum, such as the red seams of a baseball or a yellow tennis ball.

"[The lenses] really make the background drop out. Things in the foreground really come to the fore," Mr. Constantino says. "When I tried them ... for the first time, I had the opportunity to use them at a batting cage. I can't usually hit a ball, but with the lenses, I was able to track the ball better."

The gray-green lens is used when "glare and comfort are the primary concern," Mr. Constantino says. Boosting the red-green side of the spectrum, the gray-green lens gives more detail to elements such as the contour of a golf course. The gray-green lenses also have been used to block glare in sports ranging from bass fishing to cross-country skiing.

"The advantages [over wearing glasses] ... are that you don't have fogging or scratches on the lens," Mr. Constantino says. "There's no sweating behind the lens, there's no nosepiece or frame obstruction blocking the field of view; there's no slippage, either."

The MaxSight lens, released in June 2005, was tested over the course of seven seasons by Oregon's Pacific University baseball team and Dr. Graham Ericson, vice chairman of the American Optometric Association's Sports Vision section.

The lenses were so popular that "we had trouble getting the lenses away," Dr. Ericson says. "The people who had been playing six months [with the lens] and liked [them] didn't want to give them away, and the people who hadn't had the lenses really wanted them."