Sam Worthington 'struggles with eyesight'

According to WENN, the Avatar leading man claimed that he always appears mad when he concentrates.

"People think that when I squint that I'm angry all the time. It's just that I can't f**king see," he said.

However, the actor added that it doesn't really affect him on set.

"I'm blind. I can't see. I'm short-sighted and I don't get distracted by anything on set," he said. "So it's just basically me and the other person."

/Digital Spy/