500 degree myopia patients who wear ok lenses correctly are generally effective. If they are not worn correctly, they may not be effective.
Ortho-K lenses are mainly worn at night to temporarily flatten the cornea, thus improving the patient’s naked eye vision and effectively slowing down the growth of the eye axis. When worn correctly, Ortho-K lenses are mostly effective in preventing and controlling the growth of myopia.
If they are worn incorrectly, not only will they not be effective in preventing and controlling myopia, but they may also lead to complications such as corneal and conjunctival infections.
In addition, not every patient with 500 degrees of myopia can wear Orthokeratology lenses, you need to go to the hospital for a detailed eye examination, to exclude contraindications to wear.