Pottalicious (all about HP)

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In the books, Harry's eyes are described as "bright green"—but Radcliffe's are blue. When Sorcerer's Stone was in pre-production, and told her their options: They'd tried green contacts; they could also trying making Radcliffe's eyes green in post-production. How important was it, he wondered, for Harry's eyes to be green?

Rowling said that the only thing that was really important was that Harry's eyes looked like his mother's eyes, so whoever played Lily Potter would need to have some resemblance to Radcliffe. This was a relief for Radcliffe, who had an an extremely adverse reaction to the contacts. (He was also allergic to the glasses, which made him break out in acne.)