Abstract

In this study, the variation of astigmatism axis according to the age was studied 4227 eyes of healthy eyes. The refractive errors were measured by objective and subjective refraction. The astigmatism among the total eyes was 76.5%. With-the-rule, against-the-rule and oblique astigmatism were 51.4%, 31.7% and 16.9%, respectively. The frequency of with-the-rule was the highest and against-the-rule was the lowest of all the astigmatism in the refractive error. In relation to the age and astigmatism, the with-the-rule was 68.3% in the 10's age group which was the highest among the astigmatism and the against-the-rule was 10.3% in the 50's age group and upward which was the lowest among the astigmatism. The difference in the with-the-rule and against-the-rule ratio was a little in the 30's age group. As they aged, the tendency of the with-the-rule was increased between 10's and 20's age group continually. And the tendency of the against-the rule was increased between 30's and 50's age group and upward. There was a decrease in with-the-rule and an increase in against-the-rule, with the age increase. The oblique astigmatism relationship to age could not be determined.

본 연구는 연령과 난시축 변화 관계를 알아보기 위해 안과적 질환이 없는 굴절이상안 4277안을 대상으로 타각적, 자각적 굴절검사를 실시하였다. 그 결과 전체 굴절이상안 가운데 난시안은 76.5%로 나타났으며, 연령별로는 20대가 32.1%로 가장 높게, 50대 이상에서는 10.3%로 가장 낮게 나타났다. 난시안의 분포는 직난시 51.4%, 도난시 31.7%, 사난시 16.9%로 직난시 비율이 가장 높게 나타났다. 연령별 난시축의 분포에서 직난시 비율은 10대에서 68.3%로 가장 높았으며, 도난시 비율은 50대 이상에서 72.6%로 가장 놓게 나타났다. 30대에서는 직난시와 도난시의 비율이 비슷하였고, 30대를 기준으로 30대 이전에는 직난시의 비율이, 30대 이후에는 도난시의 비율이 높게 나타났다. 연령이 증가할수록 직난시는 감소하는 반면, 도난시는 증가는 경향을 나타냈는데 이는 젊었을 때의 직난시가 나이가 들면서 도난시로 변화되었다고 추정된다. 사난시는 연령 변화에 크게 영향을 받지 않는 것으로 조사되었다.

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