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KMID : 1159320140160030385
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Korean Journal of Vision Science
2014 Volume.16 No. 3 p.385 ~ p.395
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Correlation between Refractive error and ocular parameters in adults and children
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Kim Jung-Hyun
Lee Hyun
Rhee Kang-Oh
Kim Yong-Dae
Kim Heon
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Abstract
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Purpose: To investigate the decreasing point of correlation between amount of refractive error and the ocular parameters in adults and children.
Methods: Subjects were 194 (116 adults, 78 children) living in Cheongju. The refractive error and ocular parameters were measured using a Auto-Refractor (RK-1, Canon, Japan) and IOL master (Carl Zeiss Meditec, Germany), respectively. Anterior ocular parameters were included corneal radius (CR) and anterior chamber depth (ACD), and the axial length (AL) was considered as a posterior parameter. The correlation between amount of refractive error and AL/CR ratio as a integrated ocular parameters for anterior and posterior parts was showed. After checking the correlation between amount of refractive error and ocular parameters, it was found the value in spherical equivalent that there were no correlation among the ocular parameters with axial length.
Results: The correlation between amount of refractive error and ocular parameters in adults and children showed significantly stronger with AL/CR ratio than with AL and CR alone (children r2=0.681, p=0.000; adults r2=0.723, p=0.000). It found the size of AL to disappear the correlation between anterior and posterior ocular parameters in adults and children. The correlation between CR and AL was not found in eyes with longer AL the criterion for 24 mm (r=-0.174, p=0.238), ACD and AL also was not found in eyes with criterion for 25 mm in children (r=-0.153, p=0.585). In adults, the correlation of between CR and AL was not found in eyes with longer AL the criterion for 24.5mm (r=0.178, p=0.083), also ACD and AL was not found in eyes with criterion for 26.0 mm (r=0.054, p=0.796). When the criterion of AL was converted distance (mm) into diopters (spherical equivalent), AL 24 mm was corresponded to -1.30D, 25 mm was to -3.20D in children (r2=0.609), and AL 24.5mm was to -2.10D, AL 26 mm was to ?4.30D in adults (r2=0.450).
Conclusion: The correlation among ocular parameters was existed continuously, if ever the refractive state was far from emmetropia. Therefore, the emmetropization should be consider that correlation among the ocular parameters as well as the criteria for age and visual acuity.
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KEYWORD
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Axial length (AL), Anterior chamber depth (ACD), Corneal radius (CR), AL/CR ratio, Emmetropization, Ocular parameters
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