This is a technology aided precision device that would help you align the your line of vision and the actual line ball will follow. EyeLine Golf Putting Laser Line Training Aid is kept in a position and once the stance is taken then the laser is switched on to check the difference.. Since the laser is a line, it is easy to see if it moves off-target. When used with the Eyeline Golf Putting Plane System, the laser line will track perfectly back and through. So from the putter this laser depicts the clear picture of the flow that the ball would take