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KMID : 1011420120170030249
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 3 p.249 ~ p.254
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A Longitudinal Study for 3 Years on Myopic Refractive Error Changes of Myopic Children among Patients of a Korean Optometry Clinic
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Kim Jin-Suk
Kim Jae-Do
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Abstract
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Purpose: To investigate amount of myopic progression with increase of age for children myopes among patients of a Korean optometry clinic.
Methods: It has followed up 99 children subjects (male 55, female 44) who had no ocular disease and have visited a Korean optometric clinic for mean 33±8 months (13 to 54 months) since June of 2001. Mean age of subjects at first visit was 118±23 months. Non-cycloplegic refractive error were measured 6 times using Canon RK-3(Japan) every mean 6 months.
Results: For all subjects mean of refractive errors increased ?0.78 D per year from ?2.02±1.05 D at first visit to ?4.18±1.30 D at final visit with longitudinal study, but ?0.19 D per year with cross-section study, which showed a big difference between two methods. Mean of astigmatic refractive error increased ?0.15 D per year. As progression of refractive error according to ages at first visit, refractive errors increased ?1.04 D per year for 6 years old, ?0.9 D for 7 years old, ?0.89 D for 8 years old, ?0.89 D for 9 years old, ?0.74 D for 10 years old, ?0.74 D for 11 years old and ?0.72 D for 12 years old. And it showed a tendency that the younger age was the higher progression of myopia. However it was not significantly different between each groups.
Conclusions: Follow-up results for myopic children among patients of a Korean optometry clinic showed increase of -0.78 D for myopic refractive error and -0.14 D for astigmatic refractive error per year.
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KEYWORD
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Myopia, Follow-up, Refractive error, Optometry clinic, Myopia progression, Longitudinal study
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