Corneal Reshaping Program

Our center has provided OVERNIGHT ORTHOKERATOLOGY TREATMENT since 2000:
  • This is a non-surgical means of vision correction.
  • Corneal shape is modified using specially designed, rigid contact lenses made from high oxygen permeable material to correct the focus of the eye temporarily.
  • Patients wear the lenses during sleep and remove them on awakening. If successful, they can see relatively well without contact lenses or spectacles for the rest of the day.
  • Advancement in contact lens design and material has reduced risks associated with overnight contact lens wear. However, non-compliance increases risks of complications. Patients should therefore strictly follow the instructions of their optometrists and have regular check-up.
  • For some special cases, the treatment can be used in a day wear modality. Please contact your optometrist for details.
Ortho K 1
  • to be free of spectacles or contact lenses during the day.
  • to slow the progression of myopia.
Ortho K 2
CANDIDATES Persons who are suitable for RGP lens wear and:
  • who do not have more than 4.50D of myopia and with less than 1.50D of astigmatism**.
  • whose myopia are progressing rapidly.
Higher myopia (e.g. 6.00D) reduction may be possible for some patients. However, the success rate has not been established. ** Toric ortho-k lenses are now available for those with higher astigmatism.



  • Night therapy brings convenience to those who do sports or who do not like to wear conventional contact lenses or spectacles during the day.
  • Out recent research has shown the treatment to be effective in slowing myopic progression in children.
  • On average, ortho-k can usually reduce myopia of 4.00D within two weeks. However, individual variation does exist.
  • Complications associated with conventional contact lens wear, such as dryness and irritation from dust can be avoided.
  • The treatment is reversible and can be stopped anytime. Changes to the cornea and refraction will return to baseline soon after ceasing lens wear.



  • Ortho-k is NOT a CURE for myopia. The treatment effect will wear off gradually after stopping lens wear.
  • Ortho-k lenses require more time to fit compared to conventional contact lenses. Aftercare consultations are more frequent to ensure effective and safe treatment.
  • Non-compliance or poor compliance can result in significant corneal abrasion, red eye and discomfort. Corneal ulceration may result if the condition is not detected earlier or left untreated. It is therefore important to attend regular aftercare consultations.
  • Treatment effect may vary and is patient dependent. Some patients may not be able to achieve the desired effect.
  • During the course of treatment, temporary spectacles or contact lenses may be needed.



  • find out more about the treatment such as its limitations, pros and cons, costs and compliance requirements.
  • make an appointment with your optometrist
1. to have a thorough eye examination to see if you are suitable for the treatment. 2. to understand what the treatment entails.
(Information provided by The Hong Kong Polytechnic University Optometry Clinic.)