Frequently Asked Questions About Ortho-K


Can everybody wear ortho-k lenses (OK lenses)?

Paragon ortho-k lenses are designed for individuals with myopia ranging from -1.00 D to -6.00 D, with refractive astigmatism of up to -1.75 D.


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.


Who is not a good 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 wearing OK lens or by cleaning solutions


Am I a good candidate for ortho-k?

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. If the patient is suitable, then OK lenses will be either fitted or ordered based on the measurement obtained.


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

Choosing a right ortho-k lens candidate is the first step toward a successful treatment, patients will be re-assessed at regular intervals: •one day •one to two weeks • three months • six months. After the first six months follow up without any problems, patients will be seen annually for a full eye examination, which includes assessment of ortho-k lens condition & its effectiveness and corneal health.


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.


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 during early treatment period. Patients often experience some discomfort or irritation upon insertion. This discomfort may lead to excessive blinking which can cause lens mispositioning. The discomfort often dissipates after the first 2 weeks.


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

No, there is no need to remove the ortho-k lenses if awoken during the night.


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 long does it take to achieve optimum vision?

Vision improves rapidly after a couple of hours of wearing. Most patients achieve stable day time vision within 2 weeks of nightly wear.


What are the advantages Ortho-k?

In addition to vision correction, the prevention of myopia progression is the biggest advantage of orthokeratology. Secondly, clear unobstructed vision allows patients to participate in sports activities comfortably.


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 for obtaining good uncorrected visual acuity during the day. Moreover Ortho-k is very effective for juvenile myopia control.


After regular nightly wearing Ortho-k , can patients stop wearing it for a longer period of time and still maintain good daytime vision?

Although most patients are required to wear the lenses every night in order to maintain the appropriate corneal shape, 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 cleaning regime as advised by your consultant.


Will insurance policy cover the cost?

Most optical insurance plans will cover some contact lens costs. The best way to find out the details of your specific plan is to call your insurance company.

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