DUAL FOCUS CONTACT LENSES
近視控制隱形眼鏡
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Myopia control now comes in disposable soft contacts.
MISIGHT 1 DAY
CooperVision MiSight 1 Day with ActivControl Technology is a lens originally developed for the Asian market where there are very high rates of childhood myopia. As myopia becomes a global eye health issue, this lens is now also available in Australia through selected optometrists practising myopia control. We are one of the first practices in Melbourne to offer this exciting new option to our patients. The MiSight 1 Day is a concentric dual-focus or 'multifocal' lens design, which means it has a clear distance vision zone in the centre and peripheral treatment zones. In a way, this lens mimics the effect of orthokeratology (Ortho-K) overnight corneal reshaping lenses in reducing peripheral retinal 'hyperopic defocus' — a phenomenon linked to eye elongation and myopia progression. The special multifocal optics of the MiSight 1 Day lens refocuses peripheral light rays to reduce the signal for eye growth. Ordinary single vision soft contact lenses (and regular eyeglasses) do not provide these myopia control benefits, and in fact may even accelerate myopia progression by increasing hyperopic defocus. 
Hyperopic defocus, which occurs with regular glasses and contact lens correction, is linked to increasing myopia progression.
In our experience, Ortho-K is more effective in slowing myopia progression and more customisable for the specific needs of the child, but the availability of this soft lens option is great for children who eye shape or prescription might not be suitable for Ortho-K, kids who have milder progression, or simply prefer a soft daytime lens over a rigid nighttime lens. MiSight 1 Day lenses have potentially lower risks — daily disposables are the safest type of contact lenses — which might be an important consideration for parents who have reservations about the safety of orthokeratology. Soft lenses can be more difficult to insert and remove than Ortho-K lenses, however, and there is currently no astigmatism correction available in the MiSight range. For children with moderate amounts of astigmatism, Ortho-K remains the better treatment option. As well as the MiSight 1 Day, CooperVision makes a monthly replacement soft contact lens called the Biofinity Multifocal that we and some optometrists also prescribe 'off-label' for myopia control. Although this lens was originally developed for presbyopia (the common condition where reading becomes harder with age), the optics of the lens design also allow for some myopia control effects. We normally recommend the daily disposable MiSight over the monthly Biofinity Multifocal as 1 day lenses are generally safer for kids and teenagers to reduce the potential risk of lens contamination with activities such as swimming. |
See below for other myopia control treatments.
© 2019 The Myopia Clinic | Eyecare Concepts | Kew East Melbourne
