A double murderer stabbed notorious child killer Roy Whiting in the eye twice because he was a "dirty little nonce", a court has heard.
Powerfully-built Gary Vinter, 42, picked a high profile target in July 2011 because he wanted to change the conditions in which he was held at Wakefield jail, West Yorkshire.
Whiting, a convicted sex offender sentenced to life in prison in 2001 for the murder of eight-year-old Sarah Payne, received emergency care following the attack in his cell and has made a full recovery.
Vinter appeared via a videolink from Long Lartin Prison, Worcestershire, before Mr Justice Openshaw sitting at Newcastle Crown Court.
After hearing Andrew Kershaw, prosecuting, give an explanation for the gruesome attack, Vinter said: "He was a dirty little nonce. That's why I did it."
Vinter, from Middlesbrough, sneaked into Whiting's cell and used a sharpened plastic toilet brush handle to stab Whiting in both eyes. "On the second stabbing the tip of the weapon broke leaving a piece of plastic in this victim's eye socket," Mr Kershaw said. Vinter then kicked and punched Whiting as he lay on the floor, before he left the cell.
The double murderer later told prison authorities "the only reason Whiting was still alive is he got tired during the attack," Mr Kershaw said.
Mr Kershaw had said there was no evidence of any animosity between the two. "They had not spoken," he said. "They had only been on the same wing at Wakefield Prison for a few days."
But Vinter, who is serving a whole life sentence after murdering a workmate in 1996 and his estranged wife in 2008, picked out Whiting for his notoriety, the court heard.
"It was a cold-blooded premeditated attack intending to maim at least. It was calculated to manipulate the prison authorities into changing the conditions under which he was detained."