구면수차가 다른 인공수정체를 양안에 삽입 후 안구수차 및 임상결과 분석
Comparison of Ocular Aberration and Clinical Outcome between Different Aspheric Intraocular Lenses in Both Eyes
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목적: 백내장수술 시 구면수차 값이 다른 비구면 인공수정체를 양안에 삽입한 환자들의 안구수차 및 임상결과를 비교하였다. 대상과 방법: 본 연구는 전향적 코호트 연구로 양안 수정체유화술 후 한쪽에는 음의 구면수차 값을 가지는 인공수정체(ZCB00)를, 반대 안에는 구면수차 값이 0인 인공수정체(MI60)를 삽입 후 수술 후 6개월까지 나안시력과 현성굴절력을 측정하였다. 인공수정체가 가지는 구면수차가 수술 후 안구수차에 미치는 영향을 알아보기 위해 수술 후 6개월째에 전체 안구수차와 각막수차를 WavescanⓇ과 PentacamⓇ을 이용하여 각각 측정하였고, 후낭혼탁의 발생과 정도를 분석하였다. 각막의 구면수차와 인공수정체의 구면수차를 이용하여 Ray-tracing software로 계산된 전체 안구의 구면수차를 WavescanⓇ으로 측정한 값과 비교하였다. 전체 안구의 구면수차 값은 MATLAB 프로그램으로 동공 크기를 6.0, 4.5, 3.0 mm로 변환하여 분석하였다. 결과: 총 25명의 환자가 등록되었고, 수술 전 각막 구면수차는 ZCB00군이 0.232 ± 0.119 μm, MI60군은 0.240 ± 0.117 μm였고, 두 군 간 통계적으로 유의한 차이는 없었다. 수술 후 6개월째에 측정한 전체 안구 구면수차는 MI60군(동공크기 6.0 mm; 0.296 ± 0.097 μm, 4.5 mm; 0.094 ± 0.032 μm, 3.0 mm; 0.019 ± 0.006 μm)이 ZCB00군(동공크기 6.0 mm; 0.051 ± 0.105 μm, 4.5 mm; 0.009 ± 0.034 μm, 3.0 mm; 0.002 ± 0.007 μm)보다 양의 구면수차 값이 많았다(p<0.001). 수술 후의 정보에 기반하여 Ray tracing method로 계산하였을 때에도 전체 안구 구면수차는 MI60군이 ZCB00군보다 많았다. 하지만 수술 후 1개월부터 6개월까지의 나안시력 및 구면대응치와 수술 후 6개월에 비교한 후낭혼탁의 정도는 두 군 간에 통계적으로 유의한 차이를 보이지 않았다. 결론: 음의 구면수차를 가지는 비구면 인공수정체를 넣은 안에서 구면수차가 없는 비구면 인공수정체를 넣은 안보다 수술 후 구면수차가 낮게 측정되었다. 수술 후 나안시력, 구면대응치, 후낭혼탁의 측면에서 두 군 간의 차이는 보이지 않았다.
Abstract
Purpose: We compared the ocular aberration and clinical outcome between different aspheric intraocular lenses (IOL) in both eyes. Methods: This prospective randomized controlled study was comprised of patients with bilateral cataract who received two different aspheric IOLs implanted in both eyes: negatively aspheric Tecnis® ZCB00 and spherically neutral Akreos® MI60. Total and corneal aberrations computed by Wavescan® and Pentacam® were assessed at 6 months to investigate the effects of the IOL’s spherical aberration on the eye and to analyze the incidence and degree of posterior capsule opacification. By using spherical aberration of the cornea and the IOLs, values calculated via Ray-tracing software and Wavescan® were compared. Total spherical aberration was analyzed by the MATLAB program and converting the pupil size to 6.0, 4.5, 3.0 mm. Results: A total of 25 patients were included. Regarding pre-operative corneal aberration, ZCB00 group was 0.232 ± 0.119 μm while MI60 group was 0.240 ± 0.117 μm, and there was no difference between the two IOLs. At 6 months after total ocular spherical aberration, MI60 group (pupil size 6.0 mm; 0.296 ± 0.097 μm, 4.5 mm; 0.094 ± 0.032 μm, 3.0 mm; 0.019 ± 0.006 μm) had more positive values than ZCB00 group (pupil size 6.0 mm; 0.051 ± 0.105 μm, 4.5 mm; 0.009 ± 0.034 μm, 3.0 mm; 0.002 ± 0.007 μm) (p < 0.001). When calculated using the ray tracing method, based on the results after surgery, MI60 group’s total spherical aberrations were higher than ZCB00 group. However, from 1 month to 6 months after surgery, the uncorrected distance visual acuity, spherical equivalent and posterior capsule opacification showed no differences between the two IOLs. Conclusions: In eyes with aspheric IOLs with negative spherical aberration, spherical aberration was lower than spherically neutral aspheric IOLs. Regarding postoperative visual acuity, spherical equivalent and posterior capsule opacification, there were no significant differences between the two groups.
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