A blink of an eye. That's a pretty fast action, but the mechanics behind it may require some thinking by the rigger to be applied correctly. With careful weight painting, some constraints and bones correctly positioned, we can accomplish good results.
003-Eyelids.blendfrom this book's support files. It's a head with some bones already set up for the eye's tracking. That's exactly what you would end up with in the previous recipe.
Eye.Lbone, press Shift + S, and pick Cursor to Selected in order to move the 3D cursor to that position.