The full frame refers to the frame completely enclosing the lens. The line type of the full frame is mainly determined by the frame and crossbeam. The browline frame refers to the frame that directly covers a part of the lens.

At present, there are few browline rimed glasses with crossbeams. With people's increasing demand for shape, it cannot be ruled out that such designs will exist in the future. If there were no crossbeams, the lines would mainly be determined by the upper half of the frame.

Borderless glasses naturally refer to glasses without frames. Compared to other glasses with frames, these glasses have much weaker lines, and the shape and lines of the lenses themselves are the main focus.

After understanding the structure and different types of glasses, and considering them comprehensively, it is easy to distinguish the line types of glasses.

Since facial shapes can be divided into straight and curved shapes, glasses can also be used. However, when distinguishing the line types of glasses, it is necessary to first understand the structure of glasses.

Normally, a pair of glasses is composed of a frame, lenses, legs, crossbeam, and nose pad, and the specific line types of glasses depend on the lines of these parts.

Of course, because the nose pads are inside and the mirror legs are on the side, the color of the lenses is relatively transparent, so their impact on the lines is not significant. The real elements that determine the lines of the glasses are the lines of the frame and crossbeam.

According to the lines of these two parts, glasses are usually divided into full frame, frameless, browline frame, horn frame, and eyebrow crossbar frame.