October 1999. Tiger Woods has just wrapped up a phenomenal year, winning 8 PGA Tour events at just 23 years old. After being haunted by nearsightedness so severe that it rendered him legally blind without contact lenses, Woods opts to undergo LASIK and achieves 20/15 vision.
What follows is the single most dominant season in PGA history. Woods wins 9 PGA Tour events, including an incredible three majors (he won the first major of the 2001 season, too, birthing the term "Tiger Slam.") He finished inside the top five in 17 of the total 20 PGA Tour events. He won the 2000 U.S. Open at Pebble Beach by an astonishing 15 strokes. In a sport where the smallest of margins can make a difference, LASIK undoubtedly played a role in Woods historic season.