The method we are talking about is called orthokeratology, which means that contact lenses are used to reshape your cornea, while you sleep, so you can see well during the following day.
Shortsightedness is caused when the light coming into your eye doesn't focus properly on the retina, because your cornea is not quite the right shape. Normally the problem is corrected with glasses or daily wear contact lenses. However, the same result can be achieved by reshaping your cornea either permanently, with lasik surgery, or temporarily with cornea reshaping contact lenses.
Orthokeratology lenses only give a temporarily effect - about 18-20 hours. So to see well every day you have to wear them every night. It usually takes about 2 weeks for your vision to improve, after you start wearing cornea reshaping contact lenses.
Could orthokeratology work for you?
It is important to understand that not all vision problems can be corrected by cornea reshaping lenses. It only works for myopia (shortsightedness) for up to -6 and astigmatism for up to -1.75. If your prescription is higher, cornea reshaping lenses won't work for you. They also don't work for people with hyperopia (longsightedness).
Orthokeratology lenses suit people who don't like wearing glasses or contact lenses during the day. If you have dry eyes, work in a dusty environment or simply feel discomfort by the end of the day of wearing ordinary contacts, cornea reshaping contact lenses could be a solution for you.
Compare cornea reshaping contact lenses and common contact lenses
Orthokeratology lens advantages:
Disadvantages:
If you are tired of your usual contacts and are thinking about lasik, also consider cornea reshaping contacts. The effect is similar but, unlike lasik surgery, orthokeratology contacts are absolutely safe because the effect they produce is temporary.
