However, other materials such as titanium, steel or a suitable polymeric material could be used for the cross member 14 and/or the temple members 16A, 16B. The battery compartments 22A, 22B may be machined or molded with the temple members 16A, 16B. However, it is within the scope of the present invention to construct the temple members 16A, 16B and the battery compartments 22A, 22B of some other