A Spalding man smashed a pool cue into the face of a pub customer, leaving his victim with horrific injuries, Lincoln Crown Court was told.
Ryan Stanberry has left his victim Luke Armstrong traumatised as a result of the unprovoked attack.
Mr Armstrong is still receiving hospital treatment for his injuries following the incident last month and has been told he could lose an eye.
Stanberry (19), of Johnson Avenue, Spalding, admitted inflicting grievous bodily harm with intent to Mr Armstrong on March 7. He also admitted actual bodily harm to Daniel King who he struck with the cue seconds before turning his attention on Mr Armstrong.
Stanberry was jailed for eight and a half years and was given an extended licence period which means he will be at risk of recall to prison until 2027.
The Judge, passing sentence, told Stanberry: “Your victim is disfigured. You have destroyed this man’s life. He is still going to have to face surgery. He may lose the sight of one eye and has not worked since you attacked him.
“He is traumatised. His life will never be the same again. I have read your letter. I note that out of 70 or 80 lines of writing only three lines refer to the victim. The rest is talking about yourself. You are a self-centred, dangerous, violent young man.”
Tony Stanford, prosecuting, said Luke Armstrong was having a quiet drink with Daniel King and Mr King’s cousin Simon in the pub when Stanberry suddenly walked up to them and swung a pool cue at Daniel King, striking him on the back of the head.
Stanberry then swung the cue, smashing it into Luke Armstrong. Mr King’s cousin punched Stanberry in the face and then other customers took the teenager to the floor and detained him until the arrival of police.
Mr Stanford said: “This was a completely unprovoked and completely cowardly attack. The victims were utterly defenceless.”
Stanberry, who was at the pub with his father, later told police he thought his father was about to be either threatened or attacked.
The court was told that at the time of the incident Stanberry was the subject of a three month suspended jail sentence for an assault and had previous convictions for violence.
Nick Bleaney, defending, said: “It may be that he misread a non-existent situation. The consequences have been catastrophic.
“A number of lives including his own have been devastatingly altered as a result of this.
“He recognises he has anger management issues to deal with.”