Mila KunisBehind Mila Kunis' jaw-dropping good looks and seductive stare, the 'Black Swan' star had a burning secret.

"I was blind in one eye for many years, and nobody knew," Kunis reveals in the February issue of Cosmopolitan.

Kunis suffered from chronic iritis, an inflammation of the iris that left her unable to see. "I'm not blind anymore. I had surgery a couple of months ago. They cut it open and dropped a new lens in there," she added.

In the candid interview, Kunis also opens about relationships in Hollywood (though she keeps her recent breakup from actor Macaulay Culkin under wraps) and reveals what she's looking for in a guy.