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KMID : 1159320080100030177
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Korean Journal of Vision Science
2008 Volume.10 No. 3 p.177 ~ p.187
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Study on the Correlation between Refractive Error and Ocular Components
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Jung Mi-A
Lee Hae-Jung
Jung Se-Ju
Song Yun-Young
Choi Jeong-Hoon
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Abstract
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Purpose: This study investigates the prevalence of refractive error and to study the ocular biometric correlates of refractive error.
Methods: Refractive error and ocular biometry were measured in 68 adults(68 eyes) with healthy eyes. Spherical equivalent refraction, corneal power and mean corneal radius were measured using a Topcon KR-8800 autorefractor. Anterior chamber depth, crystalline lens thickness, vitreous chamber depth and axial length measurements were made using A-scan ultrasonography. AL/CR ratio was calculated by dividing axial length measurements by mean corneal radius.
Results: Spherical equivalent refractions were measured by -3.55±2.84D(males -3.73± 3.21D, females -3.40±2.55D), and not differ significantly between males and females. Prevalence of spherical equivalent refraction were as follows : myopes (60eyes, 88.24%), emmetropes(6eyes, 8.82%), hyperopes(2eyes, 2.94%). Groupaveraged spherical equivalent refractions were as follows : myopes(-4.02± 2.69D), emmetropes(-0.33±0.13D), hyperopes(+0.88±0.18D). Astigmatism of at least 0.75D was evident in 51.47%(35 eyes) of the subject cohort. Astigmatism for these groups was as follows : with-the rule astigmatism(33eyes, 94.29%), oblique astigmatism (2eyes, 5.71%). Regression analysis of corneal toricity against ocular astigmatism revealed a strong negative correlation(r = -0.84, p < 0.0001). AL/CR ratio against refractive error were measured by emmetropes(2.93±0.02), myopes(3.12±0.14), and hyperopes(2.87±0.01). Linear regression analysis showed that AL/CR ratio correlated most closely with spherical equivalent refraction(r = -0.88, p < 0.0001).
Conslusions: A strong correlation was found between axial length and spherical equivalent refraction and the principal factor in refractive error is axial length. Analysis of biometric data has shown that AL/CR ratio has the highest negative correlation with spherical equivalent refraction, thus supporting previous studies. With-the-rule astigmatism was more prevalent than other astigmatism in this study. A strong negative correlation was found between corneal toricity and astigmatism, the principal factor in ocular astigmatism is corneal toricity.
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KEYWORD
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Anterior chamber depth, Axial length, Corneal power, Spherical equivalent refraction, Vitreous chamber depth
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