The photo eye of an automatic opening garage door is a safety feature.
Garage door photo eye beam width.
One unit emits an infrared beam invisible to the naked eye.
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The photo eye sensor is one of the most important parts of your garage door system.
These sensors sit either side of your garage door near the ground.
If your garage door sensors are outside of this range remove them entirely from the garage door frame and install leveled inside the safe zone.
The other unit is a reflector.
The second is photoelectric.
If something breaks the beam while the door is closing the opener motor automatically reverses direction and opens the door.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
Higher than that can miss many low lying objects including pets.
It consists of two units installed about 4 inches from the floor on each side of the door.