Frequently Asked Questions About Ortho-K


What are the advantages of Ortho-k?

1) Prevention of myopia progression in children.
2) Clear unobstructed vision during the day allows active individuals to participate in sports activities comfortably.
3) Convenience: no need to worry about steam fogging the glasses or dusty lenses
4) Perfect alternative to day time contact lenses as it does not cause dry-eye


Is ortho-k lens a safe treatment?

Today’s ortho-k lens material allows excellent transmission of oxygen to the cornea, greatly improving the safety of ortho-k treatment. Complications with ortho-k lenses can be minimised with strict adherence to appropriate wearing and a cleaning regime.


Am I a good candidate for ortho-k?

A number of factors determine if a patient is suitable for Ortho-K. This includes health of the eyes, cornea shapes, degree of myopia and astigmatism. To find out whether you are a suitable candidate for ortho-k treatment, a comprehensive eye examination is warranted. This includes a full refractive evaluation, an ocular health exam and a corneal shape workup using equimpments such as corneal topography. Currently, we are able to correct myopia up to -8.00D, astigmatism up to -3.00D depending on individul suitabilities. As more advanced designs become available, it is possible that this range can be further extended.


Who is not a candidate for ortho-K lens (OK lens)?

Persons who demonstrate some or any of following symptoms in the eye:

  • inflammation or infection
  • corneal diseases such as Keratoconus
  • a systemic disease that affects the eye
  • allergic reaction to OK lens or cleaning solutions


How often do Ortho-k wearers need to be checked?

To ensure the health of the eyes and effectiveness of the treatment, patients will need to be assessed at regular intervals after lenses are fitted: that is •during the first week •one month after • three months after and six months after. If no problem exists after the six month check-up, patients will be seen annually for a full eye examination, during which ortho-k lens condition & its effectiveness and corneal health will be assessed.


Can I read with ortho-k lenses (OK lenses) before sleep?

Although patients can see clearly while wearing ortho-k lenses, it is not recommended to wear Ortho-K lenses to read before sleep especially during the early treatment period. Patients often experience some discomfort or irritation upon insertion at the start. This discomfort may lead to excessive blinking which can cause lens mispositioning. Discomfort often dissipates after the first 2 weeks.


Do I need to remove ortho-k lens (OK lens) if get up during the night?

No, there is no need to remove the ortho-k lenses if get up briefly during the night. However getting up for more than 15 minutes is not recommended because it significantly reduces the effectiveness of the therapy.


How many hours do I need to wear Ortho-K lens (OK lens) at night?

It typically requires a minimum of 6 hours of sleep wearing Ortho-K lenses at night in order for the treatment to be effective.


How long does it take to achieve optimum vision?

Most patients achieve stable day time vision within 2 weeks of nightly wear.


How to remove the lens in the morning?

Whilst removal is usually easy, it is advisable that patients instil a few rewetting drops before removing the ortho-k lens. In some cases, patients prefer to use DMV remover.


How to clean an OK lens?

Cleaning procedure includes the following steps: cleaning, disinfection and storage of the lens. Although the cleaning principle is the same for different kinds of lenses, ortho-k lens requires slightly different cleaning regime. An additional regular protein removal process is usually necessary to keep Ortho-k lenses clean in order to maintain its efficacy. Please follow Ortho-k Lens Cleaning instructions carefully.


What is the difference between laser vision surgery and Ortho-k?

Although the principle of correction is the same, the chief advantage of ortho-k is that it allows patients with myopia to avoid surgery to obtain good visual acuity during the day. Unlike Ortho-K, Laser vision surgery is a non-reversable procedure, the change to the cornea is permanent. Moreover Ortho-k is very effective for juvenile myopia control.


Can I stop wearing Ortho-k lenses for a long period of time and still maintain good daytime vision?

Most patients are required to wear the lenses every night in order to see clearly during the day, although some can wear Ortho-k lenses less frequently.


How long will an Ortho-k lens last?

The lens can last up to two, even three years if patients take care of lenses by strictly following the Ortho-K lens cleaning instructions as advised by your consultant.


Will insurance policy cover the cost?

Most health insurance will cover some contact lens costs. The best way to find out is to call your insurance company.

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