에피라식 수술에서 안구 회선측정장치 사용이 난시 교정에 미치는 효과
Effects of Eye Registration on the Astigmatism Correction in the Surface Laser Ablation
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목적: Mel 80 엑시머레이저 수술시 안구 회선을 보정하기 위해 개발된 안구 회선측정장치(eye registration) 적용 여부에 따른 난시의교정효과를 비교해 보고자 하였다. 대상과 방법: 0.25D 이상 난시를 교정한 환자 중 안구 회선측정장치를 적용한 15명 27안과 기능을 적용하지 않은 29명 40안을 대상으로 하였다. 수술 전후에 현성굴절검사를 시행하였고, Alpins method를 이용하여 레이저 치료에 따른 난시의 교정효과를 분석하였다. 결과: Correction index는 안구 회선측정장치 적용군과 미적용군이 각각 0.94 (±0.30), 0.92 (±0.41)로 차이가 없었다(p=0.762). 그러나 Index of success는 각각 0.23±0.34, 0.47±0.54로 안구 회선측정 기능을 적용한 군에서 잔여난시가 작았다(p=0.03). Absolute angle of error는 각각 평균 3.52°(±7.69), 12.50°(±20.69)로 안구 회선측정장치 적용군이 오차 각도가 작았다(p=0.015). 결론: 안구 회선측정장치 사용이 안구회선을 보정하여 난시 축의 각도 오차를 줄이는데 효과적이라고 생각된다.
Abstract
Purpose: To compare the effect of astigmatism correction upon Mel 80 excimer laser surgery with or without an eye registration system. Methods: This retrospective analysis investigates a group (eye registration group) of surface laser ablation surgeries for myopic astigmatism correction, with operation on 27 eyes from 15 patients with guidance of the eye registration system and 40 eyes from 29 patients without guidance from the eye registration system. The evaluation of astigmatism correction was performed by the Alpins method, measuring the amount and axis of astigmatism before and after the operations. Results: The average of the correction index (the ratio of the surgically induced amount of astigmatism correction to the intended amount of astigmatism correction) for the eye registration group was calculated to be 0.94±0.30 and, for non-eye registration group, was 0.92±0.41, showing no statistical significant difference between the two groups (p=0.762). However, the comparison of the index of success (the ratio of the difference vector to the intended amount of astigmatism correction) favorably demonstrated the effectiveness of eye registration (0.23±0.34 for eye registration group, 0.47±0.54 for non-eye registration group, p=0.03). The absolute angle of error (AE), a measure of difference in angle between the ablated axis of astigmatism correction and the desired axis of astigmatism correction, was lower on average for the eye registration group than for the non-eye registration group (3.52±7.69 to 12.5±20.69 degrees, p=0.015). Conclusions: Eye registration-guided surface laser ablation is suggested to be beneficial for the reduction of errors in astigmatism correction.
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