1, process difference
Imported ones are superior to domestic ones in materials and manufacturing technology. As the birthplace of orthokeratology, they are more excellent in the field of orthokeratology fitting and manufacturing.
2. Design differences
At present, the brands of orthokeratology lenses sold in China all adopt VST design and reverse geometric four-arc or five-arc design. In different brands, the value of each arc segment is similar. Which brand of arc design is better needs professional doctors to judge according to their personal situation.
The turning technology adopted abroad is the most advanced magnetic levitation NC cutting in the world. It can improve the precision, avoid the polishing process, increase the smoothness and improve the molding success rate.
Extended data
pay attention to
Orthokeratology mirror, as the third kind of medical equipment, may cause corneal epithelial shedding and even inflammatory reaction if it is not properly worn, leading to corneal infection.
In fact, as early as 200 1, the State Food and Drug Administration issued an urgent notice on the management of orthokeratology. On the one hand, it affirms the role of orthokeratology, on the other hand, it also points out the existing problems. It is considered that the fitting of orthokeratology glasses is not a common commercial activity or a short-term activity, and strict requirements should be made on the qualifications of fitting personnel and the facilities of fitting units.
Xu Xinhua, a consultant of Hefu Purui Eye Hospital, told the reporter that it is not recommended for patients with myopia above 600 degrees and children under 8 years old to wear orthokeratology glasses. Although orthokeratology can slow down the progress of myopia for high myopia and high astigmatism, it is more difficult and risky for this group of people to wear orthokeratology.