Create Aim Control of the Eye

1.Create>locator

2.Rename the locator  to "L_eyeCtrl

3.Move the Locator that you desire

4.Edit>Delete all by type>Non deformer History

5.Modify>Freeze Transformation

6.Select L_eyeCtrl,and press shift select L_eyeJoint

7.Constrain>Aim

8.Test the Control