다초점 렌즈 삽입술 후 시력의 만족도를 높일 수 있는 목표 굴절력 결정에 대한 연구
The Study on Target Refraction to Improve Visual Quality in Patients Implanted with Multifocal IOL
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목적: ReSTORⓇ SN6AD1를 사용한 백내장 수술 후 이상적인 시력을 위한 목표 굴절력을 알아보고자 하였다. 대상과 방법: 수술 후 원거리 교정 시력이 0.8 이상인 128명 160안을 대상으로 6개월 후 나안 시력을 측정하여 원거리가 0.8 이상이고근거리가 J1보다 좋은 경우(1군), 근거리가 J1보다 나쁜(2군) 경우와, 원거리 시력이 0.8 이하이고 근거리가 J1보다 좋은 경우(3군), J1보다 나쁜(4군)인 경우로 나누어 수술 후 나안시력에 따른 굴절력을 비교하였다. 결과: 수술 후 6개월째에 구면 대응치는 1군이 -0.12 ± 0.51, 2군이 0.08 ± 0.54, 3군이 -0.60 ± 0.60이고 4군이 0.02 ± 0.73이었다. 3군이 다른 군에 비하여 통계적으로 유의한 차이를 보였다. 근거리 시력이 좋은 1, 3군에서 구면대응치는 음의 값을 보였으며, 원거리시력이 나쁜 3, 4군에서 구면대응치의 절대값이 0.5보다 큰 경우의 분포는 1, 2군보다 많았다. 결론: 다초점렌즈의 삽입 시 목표 굴절력을 계산할 때 단초점렌즈와는 차이가 있으며, 구면대응치가 음의 값으로 커지면 근거리 시력이좋아지나 구면대응치의 절대값이 0.5보다 클 때에는 원거리 시력이 떨어지는 경향이 있다.
Abstract
Purpose: To study target refraction to improve visual quality in patients implanted with ReSTOR® SN6AD1 IOL (intraocular lens). Methods: This study included 128 patients (160 eyes) that had undergone cataract surgery and who had a far visual acuity score higher than 0.8 after 6 months. These patients were divided into 4 groups. The uncorrected visual acuity (UCVA) at far and near were greater than 0.8 and better than J1 in the first group (Group 1), greater than 0.8 and worse than J1 in the second group (Group 2), less than 0.8 and better than J1 in the third group (Group 3) and less than 0.8 and worse than J1in the last group (Group 4). We also compared the postoperative refractive errors of the four groups. Results: At 6 months postoperatively, the spherical equivalent (SE) was -0.12 ± 0.51 in Group 1, 0.08 ± 0.54 in Group 2,-0.60 ± 0.60 in Group 3 and 0.02 ± 0.73 in Group 4. The SE value of Group 3 was significantly different compared to those of the other groups. Groups 1 and 3 who had better visual acuity at near distance show a negative value of SE, and Groups 3 and 4 who had worse visual acuity at far distance contained more individuals with an absolute value of SE greater than 0.5 compared to those in Groups 1 and 2. Conclusions: The refractive power in multifocal IOL insertion is different from that used in monofocal IOL insertion. As the SE indicates a greater myopic shift, the visual acuity is better at near distance, and, when the absolute value of SE is greater than 0.5, the visual acuity at far distance is decreased.
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