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KMID : 1011420170220010059
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 1 p.59 ~ p.63
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A Study on the Corneal Power and Refractive Error of Emmetropia and Myopia in Different Ages : from Elementary Students to University Students
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Oh Kyung-Keun
Lee Ki-Young
Shim Jun-Beom
Shim Hyun-Suk
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Abstract
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Purpose: In this study, we analyzed corneal power and refractive error of emmetropia and myopia by Aging.
Methods: With classification of emmetropia and myopia by age group (from elementary to university students) who neither have not eye diseases and nor take refractive surgery, emmetropia is defined visual acuity over 1.0, equivalent spherical power is ±0.50 D and less(astigmatism ?0.75 D and less). Myopia was is classified as ?4.00 D below and ?4.00 D or more. Then corneal power measured with Auto-REF/Keratometer.
Results: Variation in refractive error in case of myopia below ?4.00 D and emmetropia are not statistically significant (p>0.05). However, in case of myopia over ?4.00 D, it is statistically significant (p=0.007) in the high school students (?4.96±0.78 D on the elementary students, ?5.62±0.95 D on the middle school students, ?6.47±1.68 D on the high school students, ?5.76±1.65 D on the university students). In case of myopia over ?4.00 D, an average corneal power reduced a statistical significance on the middle school students (p<0.05) and increased significantly with age (p=0.009).
Conclusions: The corneal power is getting less during adolescence and then increases in their twenties. In case of an emmetropia, the corneal power decreases slightly until the age of university student. However, it is minimum on the middle and high school student in case of myopia below ?4.00 D and ?4.00 D or more, respectively. After then it shows of increase. The refraction error has increased until the age of high school student, and then it is going down on the university student. These are the results of biological changes of the eyes related to the growth of the student.
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KEYWORD
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Myopia, Emmetropia, Corneal power, Refractive error
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