Free animation courses on http://animcareerpro.com/
In this class clusters and blend shapes are introduced to rig the eyeballs, eyelids and eye brows. Clusters and blend shapes are “skin deformers” which are regularly used in Autodesk Maya for 3d character rigging in the animation industry.

3D Character Rigging class 6 of 8. This course is meant to be taken in order. Progress through the course and build your rigging skills.