What aspect of eyewear frames does the term "rimless" typically refer to?

The term "rimless" specifically pertains to the design of eyewear frames, indicating that there is no distinct frame border surrounding the lenses. In rimless eyewear, the lenses are often held together by a bridge or attached to temples without a full frame encasing them. This design choice creates a minimalist look, which many people find appealing for both aesthetic and functional reasons.

The presence of a frame border is crucial in distinguishing rimless frames from fully framed options, where the lenses are bordered by a material such as plastic or metal. The absence of this border in rimless designs highlights the lenses themselves, giving them a lightweight and almost "invisible" appearance.

While the material, weight, style, and color options can all contribute to an eyewear frame's characteristics, they do not define the rimless style directly. Thus, the focus is on the structural absence of a frame border in rimless eyewear.