Orthokeratology : Compendium of latest research


Orthokeratology practice in children in a university clinic in Hong Kong

 iGO SUMMARY: This Hong Kong study consisted of a survey evaluation with telephone follow-up of 108 short-sighted children aged 6 to 15 who had undergone Overnight Vision Correction (OVC) treatment and subsequently worn their overnight ortho-k corrective contact lenses for a sustained period of time. From an average initial level of short-sightedness of -3.5D, over 90% of respondents confirmed that their vision was now good or very good and that no adverse issues had been encountered. The study authors conclude that OVC is an effective treatment for short-sightedness and is well-accepted by children who enjoy the freedom of natural daytime vision.


PURPOSES: The aim of this study was to analyse clinical data of children undergoing orthokeratology (ortho-k) and to investigate patients'/parents' perspective on ortho-k via telephone interviews.

METHODS: Clinical records of children undergoing ortho-k from a university optometry clinic were reviewed and the effects of ortho-k on refraction, vision and cornea were investigated. A telephone interview was conducted to solicit patients'/parents' perspective of the treatment.

RESULTS: One hundred and eight files were reviewed. Median age of the children was nine years (range six to 15); mean (+/-SD) pre-treatment refractive sphere was -3.56 +/- 1.49 D and the median refractive cylinder was -0.50 D (range zero to -4.25 D). Significant refractive spherical reduction (58 per cent), improvement in unaided vision and corneal topographical changes were noted after only one night of wear. No significant change in astigmatism was found. Corneal staining was the most commonly observed complication with ortho-k and more than 80 per cent of patients were advised to apply ocular lubricants to loosen the lens before lens removal. Ortho-k was mainly undertaken for myopic control and about 90 per cent of the respondents reported good/very good unaided vision after ortho-k and ranked the treatment as satisfactory or very good. Lens binding and ocular discharge were the most frequently reported problems during the treatment.

CONCLUSION: Under close monitoring, overnight ortho-k is effective and safe for reducing low to moderate myopia and the treatment is well accepted by the children

September 2008 Clinical and Experimental Optometry, Chan B, Cho P, Cheung SW. School of Optometry, The Hong Kong Polytechnic University, Hong Kong SAR, China

For full article go to: Pubmed

Contact iGO
Follow us on...
2014 (c) iGO Optical Ltd. Registered in England and Wales Company No. 5729682 Registered office: 65 New Cavendish St, London, W1G 7LS.
Made by: Web design and web development