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pp.53-59
각막의 전체난시도에 대한 각막후면의 영향을 평가하기 위하여 Orbscan Topography System을 이용하여 각막 전후면의 곡률반경을 측정하였다. 건강하고 안질환이 없는 53명의 대학생(평균 연령 22.7 ::t 3.08세)을 대상으로 좌우안 3회씩 측정하였다. 각막 전면의 평균 곡률반경은 수직경션이 7.71 ::t 0.29 mm였고 수평경선은 7.88 ::t0.28 mm 였다. 각막후변의 평균 곡률반경은 수직경선이 6.14::t 0.30 mm, 수평경선은 6.76 ::t0.35 mm였 다. 각막 전후면 모두 수직경선의 곡률이 수평경선보다 더 심한 직난시를 보였다. 각 막전면만 고려한 각막 난시도는 평균 1.21 ::t 0.78D 였고， 각막후변을 고려했을 때 각막 난시도는 1.oo ::t O.68D로， 각막후면을 고려 했을 때 각막난시도가 평균 0.21 ::t 0.27D 감 소하며 유의성이 있었다
This study measured the radii of curvature of the anterior and posterior surfaces of the comea by use of Orbscan Topography system, in order to investigate effect of posterior comeal astigmatism for total comeal astigmatism. The subjects were healthy 53 college students whose mean age was 22.7 :1:: 3.08 years old. We measured the radii of comeal anterior and posterior surfaces in the subjects, three times respectively. The result of measurements for the radii of comeal anterior surface was that the mean value for the vertical meridian was 7.71 :1:: 0.29 mm and for the horizontal meridian was 7.88 :1:: 0.28 mm. The radii of comeal posterior surface was measured that the mean value for the vertical meridian was 6.14 :1:: 0.30 mm and for the horizontal meridian was 6.76 :1:: 0.35 mm. The anterior and posterior comeal surfaces were on average flatter horizontally than vertically, so the anterior and posterior comeal toricity was found with - the - rule astigmatism. The mean value of the comeal astigmatism arising from comeal anterior surface only was 1.21 :1:: 0.78D. The total comeal astigmatism decreased to 1.00 :1:: 0.68D once the posterior comeal surface was taken into account. This constituted an average reduction of 0.21 :1:: 0.27D, which was found to be statistically significant.
