Pictures have been released following an attack outside a takeaway in Preston city centre.
A 21-year-old man was set upon outside Cafe Zeus in Lancaster Road.
The victim was left with a fractured eye socket after being punched in the face between 2am and 3am on 7 April.
He later went to Royal Preston Hospital and needed eye surgery.
Preston Police have released two CCTV pictures of a man they wish to speak to.
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PC Matt Butcher said: “This was a particularly nasty assault which left the victim requiring corrective surgery to realign his eye and eye socket.
“We have conducted a number of enquiries and would like to speak to this man in connection with the offence.
“We believe someone will know who this man is.”
Anyone with information can contact police on 101 quoting crime reference SA1806301.
Alternatively, independent charity Crimestoppers can be contacted anonymously on 0800 555 111.