A drug-addled Melbourne man who threw a saucepan of acidic drain cleaner in another man's face, leaving him with permanent scarring and vision loss, has been jailed.
John Barron-Kevan, 32, launched an unprovoked attack on Ahmed Rabi at a Carlton housing commission building in January 2016.
Mr Rabi had come to the door late at night seeking to retrieve a mountain bike and collect $150 owed to him.
Barron-Kevan asked him to wait at the door and returned minutes later with a small saucepan.
"In a single motion you threw the contents of the saucepan into Mr Rabi's face," County Court Judge Paul Higham said during sentencing on Wednesday.
"The saucepan contained Moflo liquid, which is a drain solvent containing sulphuric acid.
"It splashed into his face, eyes and all over his clothing."
After the acid attack, a struggle broke out and Barron-Kevan's then girlfriend also became involved.
"She smashed a wine bottle on Mr Rabi's head," the judge said.
Barron-Kevan pleaded guilty to recklessly causing serious injury and was jailed for seven years on Wednesday.
Mr Rabi required 12 stitches in his head and the acid burned his face, hands and upper body.
He was placed in an induced coma and was in intensive care for three days.
He suffered partial vision loss in both eyes and there will be "enduring deterioration" of his eyesight.
"He is permanently disfigured," Judge Higham said.
To this day Mr Rabi does not know why he was attacked.
"The assault was entirely without motive," the judge said.
"Your victim would like to know why you did what you did, and you cannot tell him."
At the time, Barron-Kevan had a serious drug problem, taking heroin and ice, and had hardly slept for days.
He has been in custody since August 2016 and has returned clean drug tests in recent months but has put on some 45kg.
He was ordered to serve four years and nine months in prison before being eligible for parole.