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KMID : 0360220070480081119
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Journal of the Korean Ophthalmological Society
2007 Volume.48 No. 8 p.1119 ~ p.1125
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Changes of Refractive Errors and Optometric Values in Fourth Graders at an Urban Elementary School in Korea
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Han Eun-Ryung
Kang Ji-Eun
Jun Roo-Min
Choi Kyu-Ryong
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Abstract
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Purpose: To evaluate changes in refractive errors and quantify optometric values in 4th graders at an urban elementary school in Korea.
Methods: A total of 188 school children (376 eyes) were assessed in a population-based, cross-sectional and longitudinal follow-up study between March and December 2003. Uncorrected visual acuity, best corrected visual acuity, corneal refractive power measured with auto keratometer (KR-8100, Topcon(R) Inc., Japan), axial length measured with A-scan ultrasound biometry (A/B-scan system 835, Humphrey(R) Inc., Dublin, CA), and cycloplegic refraction were evaluated on March and December, respectively.
Results: Mean visual acuity decreased from -0.15±0.29 LogMAR to -0.20±0.35 LogMAR and mean spherical equivalent (SE) showed myopic progression from -0.65±1.57 diopter (D) to -0.88±1.75D. The prevalence rate of myopia (≤-0.50D SE) was increased from 44.1% to 50.3%, while that of hyperopia (≥+1.00D SE) was decreased from 8.0% to 5.8%. Mean corneal refractive power changed from 43.21±1.29D to 43.35±1.31D, and mean axial length changed from 23.38±0.88 mm to 23.60±0.92 mm, respectively.
Conclusions: We assessed the changes of refractive errors and quantified the optometric values in a population-based, longitudinal follow-up study. The results showed that the prevalence of myopia and the mean axial length increased during our study in urban elementary 4th graders in Korea.
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KEYWORD
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Optometric value, Refractive error, Myopia
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