Short-sighted ? – Orthokeratology vs MiSight for Treatment for Myopia
At Insight Optometrists we offer both Ortho-K or Orthokeratology and MiSight treatments for the control of myopia, or short-sighted vision in children. Both methods make use of contact lenses, but which one is the right choice for your child?
The main difference is in when the treatment actually takes place. MiSight are daytime lenses, whereas Ortho-K lenses are worn at night. This means that, with Ortho-K overnight lenses, vision correction is not generally needed during the day.
Ortho-K lenses are hard, gas permeable lenses that gently reshape the cornea of the eye during the night in order to correct the eye’s refractive power to provide good vision during the day. The effect may last up to two days, though nightly wear is recommended, for at least 6 to 8 hours.
MiSight lenses are much more similar to regular contact lenses, in that they are daily wear, disposable soft contact lenses. They are a special dual-focus lens which means that, in addition to regular distance correction, they also have zones that treat the myopia at the same time. They need to be worn for 10 hours per day, at least 6 days per week.
Who can wear them?
Anybody, of any age, who is short-sighted can wear Ortho-K lenses, although there are upper limits to the myopia and astigmatism of -5.00 D and -3.00 D, respectively.
MiSight lenses are for myopic children and young people up to 18 years old, ideally in the age range of 8 to 12 years. They work over a wider range of short-sighted vision, from -0.25 D up to -6.00 D. After the age of 20, the wearer will change to using standard daily disposable lenses.
Which treatment is best?
Both types of lens require some accommodation in terms of learning how to insert and remove them and getting used to their fit and effect on the eyesight. Being soft contact lenses, MiSight are initially more comfortable than the hard Ortho-K lenses. With being worn at night, though, there is reduced blinking with Ortho-K lenses, so they are generally quite well tolerated.
Sometimes there is a short period of visual adjustment to the MiSight lenses. This happens initially, while the brain is adjusting to the two different focus zones within the same lens. If this does occur, it is usually quickly overcome and wear becomes natural. As daily, disposable lenses, there is much less handling and cleaning which means the MiSight lenses are more hygienic and hence safer for use by younger children.
Orthokeratology lenses are slightly more expensive, since they ideally last for 1 year and need to be carefully cleaned and cared for during that time without being lost or broken. MiSight lenses are simply disposed of at the end of each day.
Both Orthokeratology and MiSight treatment methods allow freedom from glasses for daily activities, especially sports, though MiSight lenses should not be worn for swimming or in very dirty environments.
At Insight Optometrists, Indooroopilly, we prescribe both Orthokeratology and MiSight contact lenses for myopia control, achieving good results for our clients with both treatments. We will help you assess the suitability of both options and ascertain which choice of myopia treatment is best for your child.