- The Better You Can See Your Sights, The Better You Can Shoot. We Brought Fiber-Optics To The Shooting Sports Industry Decades Ago For This Very Reason. TFO® Pairs Our Fiber-Optic Sights With Our Tritium Night Sights To Create A Consistently Bright Sight Picture — Day Or Night! Our Patented Combination Of Tritium And Fiber-Optic Technologies Unites The Best Of Both Worlds — Providing The Same Bright Sight Picture Whether You Are In Glaring Daylight Or Complete Darkness.