Apple chief executive Tim Cook has told a summit that the company doesn't want customers to spend all of their time on its devices.

Medical bodies and professionals have warned about the amount of time that adults and children are spending in front of screens, although suggested optimal amounts differ.

Governments have warned that technology companies design addictive games and media platforms to encourage users to turn them a profit, regardless of how that may affect their health.

But, speaking to the Time 100 Summit, Mr Cook refuted the suggestion that this was what Apple wanted to do.

"Apple never wanted to maximise user time, we're not motivated by this by a business point of view," he said.

Mr Cook added: "Every time you pick up the phone, it means you are taking your eyes off the person you are dealing with.