A man accused of sexually assaulting two sisters when they were girls returned at least seven years later to rape one of his alleged victims, a court has been told.

Michael Fieldew, 60, has been committed to stand trial on more than 50 charges of sexual assault, including several counts of rape, over a series of alleged attacks in Mooroolbark and Lilydale.

The judge described the crime as an ''abhorrent violation of a vulnerable woman". Credit:Penny Stephens

He pleaded not guilty to all charges following a four-day committal hearing in Melbourne Magistrates' Court this week.

Mr Fieldew is charged with sexually assaulting the sisters between January 1979 and September 1983.