A shop assistant was blinded in one eye after being attacked by teenagers in Greater Manchester, police have said.
The boys, described as 16 to 17, burst into a shop in Wood Street, Middleton, and demanded cash from the till.
When they could not open it, they set upon the 48-year-old victim. He fell, rupturing an eye socket and fracturing a cheekbone.
The incident happened at 1800 GMT on 30 November. Police have released the details to try to trace the teenagers.
Det Con Russ Clarke, of Greater Manchester Police, said: "The victim in this case has sustained injuries which will affect him for the rest of his life.
"I'm appealing to anyone who knows who has done this to think about that man and do the right thing by calling police.
"I would ask anybody who saw anything suspicious in the area around 1800 GMT that night or if you saw the offenders going into or leaving the shop to please come forward and assist the police."