Pentacam으로 측정한 정상 한국인에서 각막 전후면의 구면수차
Anterior and Posterior Corneal Spherical Aberration Measured With Pentacam in the Korean
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목적: 한국인에서 Pentacam (Oculus Inc., Germany)을 이용하여 정상 각막 전, 후면의 구면수차를 측정하고 그 범위와 연령에 따른변화를 확인한다. 대상과 방법: 20세에서 79세까지 240명 240안을 대상으로 Pentacam을 이용하여 각막 전면과 후면의 구면수차를, 90명을 대상으로양안에 대하여 구면수차를 측정하였다. 결과: 남녀비는 103:137, 평균연령은 49.8세(20-79세)였다. 평균 각막 전면수차는 0.230 μm, 후면수차는 -0.04 μm, 전체각막수차는0.19 μm였고 남녀간, 좌우안 사이에 통계학적인 차이는 없었다. 연령이 증가함에 따라 전, 후면, 그리고 전체각막수차는 증가하였고,구면수차의 범위는 전면 구면수차의 경우 -0.177 μm에서 0.423 μm, 후면의 경우 -0.083 μm에서 0.034 μm, 전체각막의 구면수차는-0.238 μm에서 0.410 μm까지 분포하였다. 결론: 한국인의 전체 각막 구면 수차는 연령이 증가함에 따라 증가하고 그 평균값은 0.19 μm이며 일부 환자에서는 평균치와 큰 차이를보이므로, 비구면 인공수정체를 선택함에 있어 각막 구면수차에 대한 확인이 필요할 것으로 생각된다.
Abstract
Purpose: To evaluate the spherical aberrations of the anterior and posterior surfaces of normal corneas using Pentacam in a Korean sample population and determine their ranges and changes with age. Methods: We used Pentacam (Oculus Inc.,Germany) to measure the anterior and posterior corneal spherical aberrations of 240eyes in 240 patients with normal corneas who visited our clinic. The means and ranges of spherical aberrations and their changes with age were determined. We examined both eyes of 90 patients to confirm the inter-ocular symmetry in spherical aberration. Results: The mean age of the 240 patients (M:F=103:137) was 49.8 years (range: 20-79), and the mean spherical aberrations of the anterior and posterior surfaces of the cornea were 0.230±0.078 μm, and -0.04±0.021 μm, respectively. The mean total corneal spherical aberration was 0.19±0.087 μm. There were no differences between males and females, and inter-ocular symmetry was observed in all tested patients. There was a tendency for the values of anterior, posterior and total corneal spherical aberration to increase with age. Ranges of spherical aberrations were from -0.177 μm to 0.423 μm in the anterior cornea, from -0.083 μm to 0.034 μm in the posterior cornea, and from -0.238 μm to 0.410 μm in the total cornea. Conclusions: In a Korean population, the mean total corneal spherical aberration was 0.19 μm, which was shown to increase with age. Some patients were shown to have an extreme value. Based on these results, a preoperative analysis for corneal spherical aberration may be helpful when selecting aspheric intraocular lenses.
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