Angus T. Jones struggles with his sight

Angus T. Jones fumbles through shooting on hit TV show Two And A Half Men as he is "almost legally blind" but can't wear his glasses on set.

The 18 year old, who has been part of the popular sitcom since the age of eight, struggles with his sight and wears special glasses when he is not working.

Jones has learned to plan out and memorise all of his on-set directions so he can film scenes without being able to see properly.

He tells the New York Post, "I'm wearing glasses. I can't see. I'm almost legally blind. I've gotten used to not wearing them on the show because I determine what I need to (do) and work it all out in rehearsal."