A MAN was blinded in one eye after being attacked in his sleep by the man from whom he had just won $15,000, the District Court heard yesterday. Unemployed Sum Ka-leung, 27, admitted wounding cleaning company owner Ko Sau-ming, 32, with intent and was sentenced to four years' jail. Sum also pleaded guilty to two counts of robbery and one of possession of an offensive weapon. For these offences, he was sentenced to a total of six years' jail by Judge Kilgour, who ordered that the penalty run concurrently with the prison term for the wounding charge. The court heard that Sum, who had a string of previous convictions ranging from robbery to claiming to be a member of a triad society, had committed the second robbery and the wounding while he was on bail pending trial for the first robbery, which occurred on March 3 last year. Prosecutor Alex Lee told the court that Mr Ko bumped into Sum in Hunghom on January 10. The pair went to a flat in Bulkeley Street to play cards. During the game, Sum lost $15,000 to Mr Ko. Mr Ko fell asleep at the flat after the game. Sum attacked him with a chopper, injuring his left eye and severing two of his fingers. Sum was arrested on April 11. Passing sentence, Judge Kilgour said wounding a sleeping man was a serious offence, disregarding the character of the victim.