Mia Farrow was in a relationship with Woody Allen for 12 years
Ms Farrow, who now lives in Florida under a different name, said she developed an eating disorder and was self-harming following the incident.
"That he got away with what he did to me haunted me as I grew up," she writes.
Of the panel who dismissed her claims back in 1992, Ms Farrow says: "Sexual abuse claims against the powerful stall more easily. There were experts willing to attack my credibility."
She said she decided to break her silence after two decades, when Woody Allen's latest film, Blue Jasmine, was nominated for an Oscar last week.