Orthokeratology lenses, commonly known as OK lenses, are rigid corneal contact lenses (contact lenses) that are made of highly permeable materials and are individually designed and produced according to the geometry and refractive status of the patient’s cornea. It is a reversible physical therapy for myopia, as it reduces myopia and astigmatism and slows down the rapid development of myopia by gradually flattening the anterior surface of the central zone of the cornea through the action of the tear lens under the lens.
More than 40 years ago, optometrists discovered the orthopedic effect of rigid contact lenses on the cornea, especially after more than 10 years of rapid development, scientists have continued to propose more scientific, better and more comfortable designs by improving the permeability, physical and chemical stability, biocompatibility and anti-precipitation of materials, and using CNC lathes and polishing technology to manufacture and process high-precision lenses, which have made the cornea The accuracy, speed, predictability and safety of orthokeratology have been improved to a great extent, which has been recognized by authoritative experts in optometry internationally and approved by five professional optometric colleges in the United States and the FDA.
The continuous growth of the eye axis is the main reason for the increasing myopia of teenagers. Although frame glasses can improve corrected visual acuity, they do not control the development of the eye axis. OK lenses can not only rapidly improve naked eye vision in the short term, but also significantly delay the growth of the eye axis and control the rapid development of myopia.
In the absence of effective methods to prevent myopia and control the development of myopia in youth, keratoplasty is a feasible non-surgical correction method to obtain clear naked eye vision.
The main advantage of OK lenses is that the treatment process is non-invasive and does not significantly alter the physiological structure of the cornea, and the morphological changes can be restored to the preoperative state in about one month after discontinuation of wear.
The main conditions suitable for wearing keratoplasty lenses are.
1, adolescents over 6 years old, with some self-care ability and with persistent progression of myopia.
2.No significant corneal conjunctival abnormalities, or other eye diseases, and no serious systemic diseases.
3, clear motivation and very good compliance.
4, understanding of the mechanism of action of keratoplasty and its potential problems and limitations of correction.
5, spherical lens degree 0.75-6.00D (especially recommended – below 4.00D), <1.50D cis-regular corneal astigmatism, or ≤0.75D retro-regular astigmatism.
6, corneal curvature range 41.0-45.5D.
7, have a certain financial base and can afford lenses or other costs during treatment.
8, adults engaged in certain occupations such as firefighters, pilots, police officers, etc. who are not convenient to wear glasses.
Contraindications for plastic lenses mainly include.
1, patients with high expectations and certain misconceptions, such as unrealistic belief that the method can cure myopia.
2, obvious eye disorders.
3, cone corneas.
4, refractive error >6.00D, retrocontrast astigmatism >1.00D, ciscontrast astigmatism >2.00D.
5, patients with large pupils.
6, young, unable to care for themselves and with poor personal hygiene.
7, intraocular pressure outside the normal range.
8, those who cannot complete the follow-up operation, and those with poor compliance in fitting and follow-up.
Corneal shaping lens fitting is a strict medical practice, the fitting personnel must be ophthalmologists in regular hospitals, and must undergo strict training in basic optometry and contact lens theory and operation, to master the correct method of patient correction and management, and quality control of the product, as well as the corresponding complete instrumentation support, with a high degree of responsibility and patience.