Which is better, orthokeratology mirror or frame mirror?

Orthokeratology glasses and rimmed glasses have different functions: Orthokeratology glasses prevent your myopia growth, and myopia glasses control your degree growth, and the wearing time of the two glasses is different. Orthokeratology glasses are for you to wear when you sleep at night, and myopia glasses are for you to wear in your daily life and work.

Orthokeratology mirror is made of breathable hard contact lens material, also known as RGP material. RGP is the abbreviation of Rigid Gas Permeable, which is "breathable hard material". It is developed on the basis of airtight hard material PMMA. The "OK mirror" often seen in the market is actually a orthokeratology mirror.

Non-metallic materials commonly used in the manufacture of spectacle frames are mainly made of synthetic resins, which are divided into thermoplastic resins and thermosetting resins. ?

1, celluloid: it is a kind of material used to make glasses for a long time, and it was rare at the beginning of 2 1 century. Celluloid has good plasticity and hardness, and can be dyed into various colors. Its disadvantages are poor stability and easy corrosion and aging. When rubbed, it emits camphor smell, which can be used to identify this substance. Because of its easy aging and burning, it has been rarely used.

2. Acetate fiber: Compared with celluloid, acetate fiber is not flammable. Generally, chemical hangers are made of this material, which can be divided into injection hangers and plate hangers according to processing methods.

3, injection-molded frames: low cost, seam, rough, used for sunglasses low-end frames (hot processing and manufacturing).

4. Dining plate rack: cold-worked, fine in workmanship, good in quality and durable. Most nonmetallic frames are carbon crystal frames made of plates. It is characterized by high strength and firmness, but the material is fragile and easy to crack after being impacted in winter. The way to distinguish the carbon crystal frame is that there are obvious cutting marks at the temple.

5. Epoxy resin: light weight, bright color, good elasticity and long service life. Epoxy resin was first developed by European optical company, which is mainly used to manufacture racks of well-known brands such as CD and Dunhill. The way to distinguish epoxy resin is that there is no core at the temples, while the acetate frame has a metal core. In addition, the epoxy frame is brightly colored.