To align the photoelectric eyes on your garage door opener, start by unplugging the opener. Next, locate the eyes on either side of the door’s opening. There will be a small LED light on each eye. Use a level to make sure that the eyes are mounted horizontally, then use a tape measure to ensure that they are mounted at the same height. Finally, use the adjustment screws on each eye to move them until the LED lights are lined up with each other. Once the lights are lined up, plug the opener back in and try opening and closing the door to see if the problem has been resolved.