David Fulton is a retired professional cricketer who, according to Wikipedia, is now a cricket journalist.  Wiki also says:

Whilst preparing for the 2003 season, Fulton was hit in the eye by a ball from a bowling machine, whilst practising the hook shot. The injury ruled him out for the first eight weeks of the season, and Fulton admitted upon standing down from the captaincy three seasons later that his eye was still troubling him.

According to all-star commenter Angel Eyes Van Cleef, "He's made the clip available to warn about the dangers of getting hit in the eye with a hard ball at 90mph. I think that's the lesson to be learned here."  I agree.  We should definitely only use this video for learning purposes.  And if you're anything like me, what you learned is that slo-mo replays of injuries are still totally fucking awesome.