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.
2017 March 15, CCTV 3. 15 party exposure. Zhengzhou Keshi Optical Technology Co., Ltd. fraudulently used student information to sell orthokeratology lenses in the name of school physical examination.
Orthokeratology is a special RGP lens. Ordinary RGP lenses are used to correct vision, while plastic lenses are used to "correct", that is, to improve vision by changing the shape of corneal aggregates.
The inner surface of the "corrective" RGP lens is parallel to the surface of the cornea, and they coincide with each other. Adjust the luminosity of the lens by changing the outer surface of the lens. Plastic mirrors used for "orthopedic" are the opposite. Its outer surface is simple and its inner surface is relatively complex. The inner surface of the plastic mirror is no longer parallel or consistent with the cornea, but creates some gaps between the lens and the cornea, and achieves the "orthopedic" effect by using the role of tears.
Orthokeratology mirror has experienced four generations of design, but the first three generations are no longer suitable for the needs of modern people. The latest generation of design belongs to the fourth generation, and the treatment effect is much faster than before, so it is also called "rapid shaping method". The patient wears it for one night, and the correction effect is very obvious. The follow-up treatment cycle is 10-30 days, and the final treatment effect is achieved.
Modern orthokeratology mirror adopts four-zone design. These four areas are: base arc area, also called central optical area or treatment area; Inversion arc region; Positioning arc area, also known as adaptive arc area; And a peripheral arc region.
On February 13, 2008, China State Food and Drug Administration approved the first domestic enterprise to produce plastic glasses, and further standardized the refractive range and various parameters used.