A thug threw an ammonia-like substance into the face of a student busker causing horrific chemical burns to his eyes, a court was told.

The High Court in Glasgow heard 57-year-old George Kerr carried out the unprovoked attack on 22-year-old music graduate Greg Aitken in Ashton Lane in Glasgow's trendy West End on September 12, last year.

Musician Mr Aitken has been told by doctors that it is not yet possible to assess the full extent of the damage.

He is currently unable to work and is extremely worried about the long term consequences.

Advocate depute Ian Wallace, prosecuting, said: "Mr Aitken had liquid in his hair and eyes and over his face.

"He immediately felt intense pain and burning in his eyes and nose and was unable to see."

The court heard that a steward at a nearby pub threw water over him in a bid to wash away the noxious substance.

A friend then took him by taxi to the Western Infirmary where he was treated before being transferred to an eye specialist at Gartnavel Hospital.

Before the brutal attack Mr Aitken's sight was perfect, now it is blurred, and he can only see things which are around four inches from his face.

He has to wear sunglasses all the time because daylight hurts his eyes, which are bloodshot and sore.

The court was told Mr Aitken was unable to stay in his flat because of his poor vision and moved back in with his parents.

Kerr, of Bilsland Drive, Glasgow, who is unemployed, and has convictions for dishonesty and road traffic offences admitted assaulting Mr Aitken by throwing an unidentified noxious substance onto his face and eyes to his severe injury and permanent impairment.

The court heard Mr Aitken regularly busked in Ashton Lane and in early September had an argument with beggar Colin Sly, who grabbed him round the clothing and neck.

Mr Aitken punched Mr Sly to get him off.

Mr Sly then ran off.

On September 12 around 6.30pm Mr Sly walked along Ashton Lane with Kerr and pointed out Mr Aitken saying: "That's him."

At the time Mr Sly had a cast on his arm and shouted at Mr Aitken saying: "I'll get you in two months."

Mr Aitken took this to mean that Mr Sly intended to assault him once his cast was removed.

Two hours later Kerr walked up and threw a paper cup full of an alkaline liquid at Mr Aitken. He was later identified from photographs and at an identification parade.

Kerr, who has been in custody since last October, will be sentenced next month.

Judge Lord Bannatyne asked for an up-dated condition report on Mr Aitken's eyesight to be available then.