1.Fullrim frame

A frame with a complete mirror ring is a full frame. The full frame has good strength, suitable for athletes and children to wear, because the lens periphery is completely protected by the lens ring, suitable for fitting a variety of refractive parameters of the lens.

2, half-rim frame

Half frame type is also called wire drawing frame. This kind of frame is generally made of metal or plastic material on the upper part of the mirror ring, and it is slotted inside and inlaid with nylon wire. The lower part of the mirror ring is made of a very thin nylon wire (drawing) as the lower part of the mirror ring. There are also very few frames on the market with the drawing part designed in the upper part of the mirror ring. The processing and fitting of such glasses requires grooving on the edge of the lens after grinding, and inserting the wire and drawing on the frame into the groove of the lens to fix the lens. Since grooves need to be made at the edges after grinding and forming, and the width of the grooves is about 0.6mm, a certain edge thickness of the lenses is required, so that a certain thickness of the lenses can be left on both sides of the grooves to maintain sufficient strength. Since the lower part of the lens has no ring shielding, and the edge of the lens is too thick and will affect the appearance, so the lens with small diopter number and the lens with large diopter number are not suitable for this kind of frame.

3, rimless frame

Rimless frame is also known as punching frame, this type of frame is divided into parts and one piece. The part type is composed of a nose bridge (together with the nose rest) and two mirror legs (together with the pile head). A frame material is connected between the bridge of the nose and the head of the pile, connecting the bridge of the nose and the leg of the mirror as a whole. However, there is no connection between the material of this part and the lens, which seems to be between half frame and no frame. The fitting processing of such glasses is to cut through holes on both sides of the lens edge after grinding and forming, and fix them on the bridge of the nose and the head of the pile with screws, nuts, flat pads and cover pads. As the lens does not have the protection of the lens ring, in the use of glasses, the external force of the glasses, through the pile and the bridge of the nose directly acted on the lens, at the same time because of the weak hole and the existence of internal stress, it is easy to cause the lens broken. Therefore, the lenses are required to have a certain edge thickness. At the same time, because there is no cover of the mirror ring, considering the appearance requirements, the lenses with 

4, combination frame

This type of frame is divided into two groups of mirror rings, usually the front group is equipped with colored lenses, and the back group is equipped with lenses for correcting refractive errors. For outdoor wear, use two sets of lenses, which have the protective function of sunglasses, but also provide a clear view. When used indoors, the front set of lenses can be turned up or removed, which provides a certain convenience for wearing sunglasses for patients with refractive errors corrected by frame glasses. The existence of two sets of lenses increases the weight of glasses and affects the comfort of wearing them. On the other hand, due to the limitation of structural space, patients with large lens thickness and high diopter should choose carefully.