A see-through, near-eye, mixed reality display apparatus for providing translations of real world data for a user. A wearer's location and orientation with the apparatus is determined and input data for translation is selected using sensors of the apparatus. Input data can be audio or visual in nature, and selected by reference to the gaze of a wearer. The input data is translated for the user relative to user profile information bearing on accuracy of a translation and determining from the input data whether a linguistic translation, knowledge addition translation or context translation is useful.