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전체 각막난시에서 전면과 후면 각막난시의 상관성

Correlation between Anterior and Posterior Corneal Astigmatism in Total Corneal Astigmatism

  • 김효진 (백석대학교 보건학부 안경광학과)
  • 투고 : 2014.08.08
  • 심사 : 2014.09.18
  • 발행 : 2014.09.30

초록

목적: 전후면 각막난시와 전체 각막난시를 측정하고, 이들의 관계를 분석하여 후면 각막난시가 미치는 영향을 알아보았다. 방법: 각막굴절교정수술을 목적으로 방문한 22~28세의 31명(31안)을 대상으로 하였다. 각막질환이 있는 경우는 제외하였고, 회전 샤임플러그 카메라를 이용하여 수술 전에 전체 각막난시와 전후면 각막난시를 구분하여 측정하였다. 굴절력이 가장 큰 경선과 가장 작은 경선의 차이로 난시의 크기를 계산하였고, 가장 가파른 경선의 방향에 따라 직난시와 도난시로 분류하였다. 결과: 전체 각막난시와 전후면 난시의 평균은 $1.13{\pm}0.76D$, $1.51{\pm}0.84D$, 그리고 $-0.59{\pm}0.17D$ 였다. 후면 각막난시의 크기는 대상자들 모두 -1.0 D에서 -0.25 D에 분포하였고, 전체 각막난시의 크기를 100으로 봤을 때 전면 각막난시의 크기는 $142.9{\pm}29.9%$ 였다. 전체 각막난시는 전면난시의 크기와 가장 높은 상관성(y=0.871x-0.184, $R^2=0.982$)을 보였고, 후면 난시와는 높은 음의 상관성(y=-2.974x-0.184, $R^2=0.698$)을 보였다. 대상자들의 각막전면과 후면난시는 모두 직난시에 분류되었다. 결론: 20대 대상자의 전면과 후면 각막난시는 각각 0.2 D에서 -3.8 D, 그리고 -1.0 D에서 -0.25 D의 크기를 가졌고, 전면과 후면난시 모두 직난시의 비율이 높았다.

Purpose: To investigate the effect of anterior, posterior corneal astigmatism and total corneal astigmatism on posterior corneal astigmatism by analyzing correlation. Methods: Participants were 31 patients (31 eyes) without corneal disease at the age range of 22 to 28 who had visited hospital to receive corneal refractive surgery. The total corneal astigmatism and anterior and posterior corneal astigmatism were measured using a rotating scheimpflug camera before surgery. The magnitude of astigmatism was calculated with the difference between the meridian of the steep refractive power and the flat, and With-The-Rule and inverse astigmatism were divided according to the direction of the meridian that was the steepest. Results: The averages of total corneal astigmatism and anterior and posterior astigmatism were found to be $1.13{\pm}0.76D$, $1.51{\pm}0.84D$, and $-0.59{\pm}0.17D$. The magnitude of posterior corneal astigmatism was distributed between -1.0 D and -0.25 D in all the subjects, and when the magnitude of total corneal astigmatism was set as 100, the magnitude of anterior corneal astigmatism was $142.9{\pm}29.9%$. Total corneal astigmatism indicated the highest correlation with the magnitude of anterior astigmatism (y = 0.871x-0.184, $R^2=0.982$) and high negative correlation with posterior astigmatism (y = -2.974x-0.184, $R^2=0.698$). All the subjects' anterior and posterior corneal astigmatism was classified into With-The-Rule. Conclusions: Anterior and posterior corneal astigmatism in the subjects in their 20's showed the magnitude of -3.8 D in 0.2 D and -0.25 D in -1.0 D separately, and both anterior and posterior astigmatism indicated a high percentage of With-The-Rule.

키워드

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