Eyeglasses are not just for seeing
One of the most famous dictums associated with Modernist design is that "Form follows function." Typically, what modernists mean by this expression is that the design of a product should be dictated by the job it is to perform for users—and nothing else!
However, Modernists tended to take a narrow view of what a function is. In their view, this was limited to physical services that a product might perform for its users.