They are reverse gas permeable lenses to temporarily correct myopia They will b worn over night to alter shape of cornea to reduce around 3 d of myopia It is of either 3 or 5 zone and takes around 3 weeks for benifit to come We need to do orb scan and other tests prior 3 months assessment Total cost of procedure and type of lens 3 zone or 5 zone Amount of astigmatism Everything we need to assess Around 80000 to 1 lakh for lens and procedure This is temporary measure Irritation dry eye infection corneal ulcer overriding of lenses can occur Advantage is it can correct upto 3 d myopia and 1.5 d with the rule astigmatism....but we need to use overnight ortho k lenses Permanent solution is either LASIK OR PRK