Why the lenses won't follow the glasses?

Screenshot from 2020-04-13 22-09-20

I have joint both the lenses and the glasses frames.
Before that I Parented the lenses to the glasses.
I also used the same Armature modifier.
All the above without avail.

badglasses.blend (1.6 MB)

The glasses vertex group called head is empty. Go into edit mode, select everything, and click assign in the object data properties.

Thank you so much MWF :slight_smile: !!