Police are investigating an assault outside Manhattans in Cavendish Street, Barrow.
It happened on October 23 at about 2.25am.
A man, in his twenties, was punched to the eye, causing two fractures.
Officers would like to trace a man, white, aged about 20, of slim build and about 5ft 8ins tall. He had short, dark hair and was wearing black jeans, a black t-shirt and a black jacket.
Anyone who knows who this person might be or has any information can report online at www.cumbria.police.uk/report-it – quoting incident 19 of October 23.
You can also phone on 101.
Alternatively, you can contact Crimestoppers anonymously on 0800 555 111.