OrthoK or Corneal Refractive
    Therapy (CRT)

Also known as Orthokeratology or OrthoK, CRT is a tried and tested system, using the latest computerised technology for fitting contact lenses, to control short sight (myopia). Recent research has also shown that it can be used to slow the rate of change of myopia.  It is different from conventional contact lens wear because the lenses are worn overnight. This allows unaided vision at during the day without the need for spectacles or contact lenses. Contact the practice for more information or to book a personal consultation.

How does it work?

The rigid lenses gently mould the soft front surface of the eye. This evens out the focusing error.

Is it safe?

Yes. This technique has been used for over 30 years. Today, modern computerised technology and contact lens design is used to greatly improve the accuracy and success of this long established technique. It has been found to produce NO long-term adverse affects. If problems develop, the lenses can be removed and the eye will return to its original state very quickly.

Is it a permanent cure?

No. The effect can last for up to three days after the lenses are removed. To maintain good unaided vision the lenses will need to be worn regularly, usually overnight for between 3 and 7 nights per week. If the lenses are left out, the eye will return to the original prescription and alternative forms of correction will have to be used.

Is my prescription suitable?

Only short-sightedness can be corrected in this way. Low to moderate degrees, less than -4.00 DS and astigmatism of -1.50 DC can give excellent results. Higher degrees (up to -10.00) are possible, but may be only partially correctable, this will still give a significant improvement to unaided vision and may slow any further progreesion.

I already wear conventional lenses, can I wear Ortho-K lenses?

Yes. Each case needs to be individually assessed, but if you are wearing soft lenses, you should be able to switch very easily. If you are wearing rigid GP lenses, you may have to wear spectacles for a short time before going on to have Ortho-K lenses fitted.

Is it reliable?

Yes. The success rate is very high. An overnight trial will give a very good indication of the likely success

Is it uncomfortable?

No. The new lens materials used have exceptionally high 'gas permeability' and are fitted with close fitting edges, which limit movement of the lens on the eye. If the lenses are only worn at night, there is very little lid sensation.

Is it suitable for children?

Yes. Younger patients respond very well to this type of correction. In many cases, early fitting has been shown to slow the progression of short-sightedness. It is completely reversible and 30 years of fittings has produced no long term adverse affects. Most children are capable of handling the lenses themselves from the age of 7 years. Younger or less able children may be very successful with adult help. Lenses will be rarely lost or broken because they are only worn overnight.

How much does it cost?

An initial assessment costs £75. This includes an overnight trial and assessment of Ortho-K lenses. This will indicate whether you will be a good candidate for long term correction with Ortho-K lenses. If you wish to proceed with long term use of the lenses, the total cost is £650 (including the initial assessment fee). This covers all further fitting and aftercare appointments, and all contact lenses needed (to obtain the correct fit) in the first 12 months of the fitting and is payable as in the attached schedule.

Once the correct fit of lenses has been found and the correction stabilised, an annual check up will be required. The present cost of this is £48. If you are entitled to NHS help with the cost of examinations and spectacles, this can be used towards the cost of Ortho-K lenses. There will not normally be the need to buy spectacles.

How do I find out more?

Book an appointment for a personal consultation with Mr Orriss and don't be afraid to bring a list of any further questions you may have.