Orthokeratology (Ortho-K)
Orthokeratology is the application of specially designed gas permeable contact lenses to gradually reshape the central and peripheral cornea for the correction of short-sightedness and control of myopia progression.
Orthokeratology lens is designed based on a combination of advanced ophthalmic instrumentation and precision computer technology together with the professional knowledge and experience of the Ortho-K practitioner.
According to studies from the Hong Kong Polytechnic University and others, Orthokeratology slows down myopia progression by about 50% on average.
Safe Ortho-K requires:
- A comprehensive eye exam with special attention to the health of the cornea, conjunctiva and tears.
- Strict compliance with hygiene and lens care regimen by parents and children
- A thorough understanding of the relationship between hygiene and contact lens complications.
- Regular follow up exams
In addition to regular contact lens instruments, special equipment such as a corneal topographer and an axial length scan are essential in monitoring changes and results.
Depending on the individual, Ortho-K may show its optical effect from a few hours to a few days or weeks and optimal reshaping effects can usually be achieved with one to three pairs of lenses. The wearer will then continue with the final retainer lenses during sleep for clear vision the following day.
Orthokeratology is suitable for people of all ages, especially young children during their growth stages, as long as they meet the refractive and health requirements. The safety of Ortho-K lenses is no different from any other contact lenses provided proper fitting, hygiene, lens care and follow up are closely observed.
