 From 1939 to 1963, it was an award for a film's visual effects as well as audio effects, so it was often given to two persons, although some years only one or the other type of effect was recognized.In 1964, it was given only for visual effects, and the following year the name of the category was changed to "Best Special Visual Effects".Honorees for this award have been bestowed several times as a Special Achievement Academy Award.