The 26-year-old victim became involved in a disagreement with another man inside the club in the early hours of Sunday, July 3.
A fight ensued and the victim was punched in the face.
Today British Transport Police issued this CCTV image of a man they want to speak to about the incident.
PC David Bentley said: “The victim has lost his sight in one eye and is undergoing regular medical treatment. We are unsure at this time if he will regain his sight.
“It’s important that we speak to the man pictured – if you recognise him, please contact us.”
Anyone with information is asked to contact British Transport Police on 0800 40 50 40, or text 61016, quoting reference 290 of 4/8.
Information can also be passed anonymously to the independent charity Crimestoppers on 0800 555 111.