To be precise, OK lens is the acronym for Orthokeratology Lens, and the essence is the same. Due to the advancement of technology, orthokeratology lenses (used to be called OK lenses ten years ago) have evolved from the third-generation design ten years ago to the fourth-generation design today. Therefore there are many differences:
1) Material: The oxygen permeability value has been increased from 38 (it was a relatively good material at that time) to 100, which fully complies with the nationa
1) As far as myopia control is concerned, it is recommended to wear it until the age of 18-20, after the intensity of learning is not strong and the degree of myopia is stable.
2) Orthokeratology lenses can also be a conventional refractive correction method. Adults can also wear it if desired.