From YouTube description: Saturday Night at an unregulated amateur fight in Michigan, Alan Grays squared up with Jose Johnston. The bout was stopped however for reasons that have not previously been a part of MMA records keeping. Part of Grays’ anatomy rolled away – his eye.
The eye was of course prosthetic, as can be seen in the fact that it rolled in a circle, rather than a straight line. Human eyes are circular, and thus would tend to roll straight; prosthetic eyes are more oblong, and would roll as seen.
Source: mmaUG