논문 상세보기
pp.177-187
목 적 : 굴절이상도 및 굴절이상과 안광학 상수의 상호연관성을 알아보기 위하여 수행되 었다. 방 법 : 안질환이 없는 건강한 젊은 성인 68명, 68안(우안)을 대상으로 Topcon KR-8800 을 사용하여 등가구면 굴절력, 각막 굴절력, 각막 곡률반경을 측정하였다. 전방 깊이, 수정체 두께, 유리체 깊이, 안축장 길이는 A-Scan Ultrasonography를 사용하여 측정하였으며, AL/CR비는 안축장 길이를 평균 중심 각막 곡률반경으로 나누어 계산하였다. 결 과 : 등가구면 굴절력은 -3.55±2.84D(남자 -3.73±3.21D, 여자 -3.40±2.55D)로 남녀사이의 유의한 차이가 없었다. 전체 68안 중 근시 60안(88.24%), 정시 6안(8.82%), 원 시 2안(2.94%)으로, 등가구면 굴절력은 근시 -4.02±2.69D, 정시 -0.33±0.13D, 원시 +0.88±0.18D로 측정되었다. 원주 굴절력이 0.75D 이상은 35안(51.47%)으로, 직난시 33안 (94.29%), 사난시 2안(5.71%)으로 나타났으며 전난시와 각막난시는 높은 음의 상관관계를 보였다(r = -0.84, p < 0.0001). 굴절이상에 의한 AL/CR비는 정시 2.93±0.02, 근시 3.12± 0.14, 원시 2.87±0.01로 측정되었으며, 등가구면 굴절력과 가장 높은 상관관계를 나 타냈다(r = -0.88, p < 0.0001). 결 론 : 굴절이상은 안축장 길이에 의한 것이 중요한 원인으로 본 연구에서도 안축장 길 이는 등가구면 굴절력과 높은 음의 상관관계를 보였으며, AL/CR비가 등가구면 굴절력과 가 장 높은 음의 상관관계를 보여 선행연구와 일치하였다. 난시분포는 도난시와 사난시에 비해 직난시가 많은 것으로 나타났으며 전난시와 각막난시는 높은 음의 상관관계를 보여 전난시의 중요한 원인이 각막난시에 의한 것임을 알 수 있었다.
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). Conclusion : 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.
