Orthokeratology, commonly known as OK lenses, is a type of rigid corneal contact lens (contact lens) that uses highly permeable materials and is individually designed and made 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 precision, speed, predictability and safety of orthokeratology have been improved to a great extent;
It is recognized by international experts in ophthalmology and has been certified by five professional optometric schools in the United States and approved by the FDA.
Studies have shown that the growing eye axis is the main reason for the increasing myopia in teenagers. Although frame glasses can improve the corrected visual acuity, they do not control the development of the eye axis. OK lenses can not only improve the naked eye visual acuity rapidly 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 the age of 6 who are capable of taking care of themselves and whose myopia continues to progress;
(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) A spherical lens of 0.75 to 6.00 D (-4.00 D or less is particularly recommended), <1.50 D cis-routine corneal astigmatism, or ≤0.75 D retro-routine astigmatism;
(6) Corneal curvature range of 41.0~45.5D;
(7) have a certain financial base, can afford the lens or other costs during treatment;
(8) Adults who are engaged in certain occupations such as firefighters, pilots, police officers, etc. who are not comfortable wearing glasses.
Contraindications for plastic lenses mainly include.
(1) Patients with high expectations and misconceptions, such as unrealistic beliefs that the method will cure myopia;
(2) Obvious ocular disorders;
(3) cone cornea;
(4) Patients with refractive error >6.00D, retro-regular astigmatism >1.00D, and cis-regular astigmatism >2.00D; (4) Patients with large pupils;
(5) Young, unable to take care of themselves, poor personal hygiene;
(6) IOP outside the normal range;
(7) Those who cannot complete the follow-up operation, and those who have poor compliance with 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 equipment support, with a high degree of responsibility and patience.