Copenhagen 2016 Registration Programme Exhibitor Information Virtual Exhibition Satellite Meetings Glaucoma Day 2016 Hotel Star Alliance

10 - 14 Sept. 2016, Bella Center, Copenhagen, Denmark

This Meeting has been awarded 27 CME credits


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Ten year follow-up of overnight orthokeratology for myopia control

Poster Details

First Author: T. Hiraoka JAPAN

Co Author(s):    Y. Sekine   F. Okamoto   T. Oshika              

Abstract Details


There have been no studies that investigated long-term effects of overnight orthokeratology (ortho-k) on myopia progression for more than 5 years. The purpose of this study is to investigate 10-year effects of ortho-k on myopia progression in school children.


Kashiwa Eye Clinic, Chiba, Japan


Medical records of consecutive patients who had started ortho-k from 8 to 16 years old and continued the treatment for 10 years were retrospectively reviewed. Basic demographic data collected included gender, age, manifest refraction, visual acuity, and prescription lens power during 10 years. Time course of changes in several parameters was assessed by analysis of variance (ANOVA). Number of times of prescription lens power replacement was also examined during the study period, and the difference between the first and latest prescription lens powers was calculated, which was considered as an estimated value of myopia progression.


A total of 104 eyes of 53 patients fulfilled the inclusion criteria. At baseline, mean age was 11.5 ± 2.2 (standard deviation) years, spherical equivalent refractive error (SER) was –2.63 ± 1.22 D, and logMAR uncorrected visual acuity (UCVA) was 0.80 ± 0.28. SER and UCVA significantly improved after the start of ortho-k, and remained at the improved level throughout the study period. Mean number of times of prescription lens power replacement during the study period was 2.4 ± 1.1 times. The first prescription lens power was –3.22 ± 1.21 D and the latest one was –4.18 ± 1.29 D, showing a significant difference between them. The averaged difference in lens power (estimated myopia progression) was –0.95 ± 0.82 D.


The estimated myopia progression during 10 years in school-aged myopic children who continued ortho-k was apparently small compared with natural progression of myopia which was previously reported. This study showed that 10-year continuation of ortho-k is promising to slow myopia progression.

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