This was the hilarious moment a grandad in Manchester attempted to use a doorbell camera as a retina scanner.

The clip filmed on November 10 shows the moment an elderly man attempted to use the new doorbell when his son spoke through the microphone convincing him to use his eyes to get in.

"I've told my dad that our new doorbell with a camera is actually an eye scanner and pranked him to scan his eye to enter the house. It was hilarious, especially when he actually closed both of his eyes!" the filmer told Newsflare.