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Characters may have eyes that are controlled by bones. These bones need to be connected to blendshapes that control the gaze for eye movement to work.
Eye bones can be rigged and connected to gaze blendshapes automatically in the following way. Using the add-ons, it is possible to define which bones are eye bones, what their axes of rotation are, and how much they should rotate in each direction.
Please visit the addon section of the documentation for information on how to map eye bones.