Lead actors playing visually challenged characters is not new, but for Deepika Padukone it was a first. She describes it as her toughest role yet but also says she is exactly like the heroine - a woman who is self-confident, ambitious and never gives up.

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"For me, this role out of all the films that I have done was the most challenging. It's not been easy. It required a lot of focus and concentration. I had to observe a lot of blind people before I could play this role," Deepika, 24, said in an interview.

"I think I identify with the character Pinky a lot because Pinky is someone who is extremely self-assured. She is extremely confident, knows exactly what she wants. She is ambitious and she never gives up, which is exactly how I am," she said.