the preferred embodiment of the housing of the present invention;FIGS. 7A and 7B are a diagrammatic view illustrating the adaptive lens of the present invention;FIG. 8 is an optical diagrammatic view of a second preferred embodiment of the present invention;FIG. 9 is an optical diagrammatic view of a housing similar to FIG. 6, but illustrating a modification thereof;FIG. 10 is a block diagrammatic