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Overnight Vision Correction |
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We have optometrists who specialise in overnight vision correction (Ortho-K) at Zacks London Eye Clinics (Warren Street, Fitzrovia, London W1) and (Kings Cross, Islington, London N1) .
 Overnight vision correction (OVC), also known as orthokeratology (Ortho-K) involves using specially designed rigid gas-permeable contact lenses to alter the shape of the cornea in order to reduce or correct myopia (short-sight). The aim of Overnight vision correction (Ortho-K) is to be free of both contact lenses and spectacles during waking hours making it a viable alternative to refractive surgery. In the last few years advances in technology have made it possible to accurately scan the cornea and manufacture ortho-k lenses which achieve a controlled and precise reduction in spectacle prescription. New developments in lens materials enable this to be done safely with overnight wear.
 Most of the visual changes with ortho-k occur rapidly in the first few days requiring frequent examinations and in some cases progressive lens changes. Stabilisation procedures then follow at a slower pace over the next few months. The cornea is highly elastic, however, and always eventually returns to its original shape. For this reason, ortho-k retainer lenses are necessary to maintain the improvement in vision. They are worn either overnight or for a few hours during the day after the ideal corneal shape has been achieved.
Advantages of Overnight Vision Correction (Ortho-K):
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 Good vision without spectacles or contact lenses for most of the day
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Children can be treated effectively and there is evidence to suggest that increasing myopia (short sight) is retarded
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It is not a surgical procedure and it does not cause the permanent hazy vision experienced by some patients following laser surgery
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It is modifiable and reversible meaning that changes in prescription can be easily dealt with
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It does not hurt
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Well established ortho-k contact lens fitting techniques mean that there are very few risks
Web links:
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Contact Lenses