실리콘이 충전된 눈에서 부분결합간섭계를 이용한 인공수정체 도수계산

Intraocular Lens Power Calculation Using Partial Coherence Interferometry in Silicone Oil-Filled Eyes

목적: 실리콘이 충전된 눈에서 부분결합간섭계를 이용한 인공수정체 도수결정의 정확성을 알아보고자 하였다. 대상과 방법: 실험군은 실리콘이 충전된 눈에서 부분결합간섭계를 이용하여 인공수정체 도수를 정하고 실리콘기름 제거술과 인공수정체 삽입술을 동시에 시행한 10안을 대상으로 하였다. 대조군은 실리콘 기름을 제거한 후 초음파를 이용한 A-scan (Tomey, Nagoya, Japan)으로 인공수정체의 도수를 계산하고 단계적으로 인공 수정체를 삽입한 12안을 대상으로 하였다. 술 후 3개월째 실제 굴절값을 측정하였고, 목표 굴절값과 차이인 굴절예측이상값을 구하여 두 군의 굴절예측이상값의 평균을 비교하였다. 결과: 실험군의 술 후 3개월째 실제 굴절값의 평균은 －1.30±1.57디옵터였고 굴절예측이상값의 평균은 －0.08±1.04디옵터였다. 대조군의 술 후 3개월째 실제 굴절값이 평균은 －1.63±1.75디옵터였고, 굴절예측이상값의 평균은 －0.48±1.27디옵터였다. 두 군의 굴절예측이상값 사이의 평균은 통계적으로 유의하지 않았다(p=0.674). 결론: 부분결합간섭계는 실리콘이 충전된 눈에서 인공수정체 도수를 결정할 경우 유용하게 사용될 수 있다.

Purpose: To evaluate the accuracy of intraocular lens (IOL) power calculation in eyes that have been operated on by silicone oil removal combined with IOL implantation using partial coherence interferometry. Methods: 10 eyes of 10 patients with silicone oil tamponade were included in this study. The IOL power calculation for 10 eyes was performed using partial coherence interferometry. 12 eyes of 12 patients with silicone oil tamponade were also included in this study as control group. 12 eyes in control group had IOL implantation after silicone oil removal. The IOL power calculation for control group was performed using conventional ultrasound A-scan (Tomey, Nagoya, Japan). Three months after silicone oil removal combined with IOL implantation, actual refraction was measured. To compare the difference between the actual and target refraction, refractive prediction error was calculated. It is defined as substraction of target refraction from actual refraction. Results: At three months, actual refraction and refractive prediction error of the group using partial coherence interferometry were －1.30±1.57 diopter and －0.08±1.04 diopter, respectively. At three months, actual refraction and refractive prediction error of the control group using ultrasound A-scan were －1.63±1.75 diopter and －0.48±1.27 diopter, respectively. There was no statistically significant difference between two values (p=0.674). Conclusions: Partial coherence interferometry seems to be satisfactory accurate method to calculate IOL power in silicone oil-filled eye.