증식성당뇨망막병증에서 유리체절제술과 백내장병합수술 후 굴절력 예측
Accuracy of Intraocular Lens Power Estimation in Eyes Undergoing Phacovitrectomy for Proliferative Diabetic Retinopathy
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목적: 증식성당뇨망막병증 환자에서 유리체절제술과 백내장병합수술 전 목표 굴절력과 수술 후 실제 굴절력 사이에 어떤 차이가 있는지 분석하고, 굴절력에 영향을 미치는 요소에 대해 알아보고자 한다. 대상과 방법: 유리체절제술과 수정체초음파유화술 및 인공수정체삽입술을 동시에 시행한 환자 39명 44안을 대상으로 후향적 조사를하였다. 술 전 A-scan 및 IOL Master를 이용하여 안구 길이 및 안구생체계측을 시행하고, 술 후 굴절력을 측정하여 목표 굴절력과실제 굴절력을 비교하였으며 평균예측이상값과 평균절대예측이상값을 계산하였다. 또한 굴절력에 영향을 미치는 환자의 전신상태, 수술 과정 전, 후 인자들에 대하여 통계학적으로 분석하였다. 결과: 전체 44안의 A-scan 기준 술 후 3개월 평균예측이상값은 -0.23 ± 0.52 디옵터, 6개월의 평균예측이상값은 -0.23 ± 0.47 디옵터로 3개월 사이에는 유의한 변화가 없었다(p=0.959). 술 후 3개월의 평균절대예측이상값은 0.45 ± 0.35 디옵터, 6개월에서0.40 ± 0.33 디옵터로 3개월 사이에 유의한 변화는 보이지 않았다(p=0.196). 두 가지 검사가 모두 가능하였던 20안에서 술 후 3, 6개월 평균예측이상값은 모두 A-scan을 기준으로 한 결과가 유의하게 작은 굴절이상값을 갖는 것을 확인할 수 있었다(p=0.002, 0.002). 술 전 당뇨병성신증 병발, 술 후 발생한 신생혈관녹내장이 부정확한 평균예측이상값 및 평균절대예측이상값과 유의한 연관성을 보였다. 결론: 증식성 당뇨망막병증에서 유리체절제술과 백내장병합수술은 허용할 만한 수준의 작은 굴절력 오차 범위 내의 결과를 보였다. 당뇨병성신증, 신생혈관 녹내장을 동반한 경우에서 술 후 부정확한 굴절력을 보이며, 기대하는 굴절력을 더 정확히 얻기 위해 광학적생체계측과 초음파 모두를 사용하는 것이 바람직하겠다.
Abstract
Purpose: To evaluate the accuracy of intraocular lens (IOL) power estimation and the factors associated with outcome in eyes undergoing combined phacovitrectomy for proliferative diabetic retinopathy. Methods: We performed a retrospective case review of 39 consecutive patients (44 eyes) that underwent phacovitrectomy for proliferative diabetic retinopathy. Axial lengths were measured using ultrasound (A-scan) and/or optical biometry (IOL Master). Achieved and predicted refractions were compared to calculate the mean postoperative refractive prediction error (ME) and the mean absolute prediction error (MAE). Systemic conditions of patients and several preoperative and postoperative factors related to the postoperative refraction were analyzed. Results: The ME of 44 eyes were −0.23 ± 0.52 diopters (D) and -0.23 ± 0.47 D after 3 and 6 months, respectively (range, -1.40~+0.79 D). There was no statistically significant difference in the refractive outcomes between the refractive errors (p = 0.959). The MAEs were 0.45 ± 0.35 D and 0.40 ± 0.33 D after 3 and 6 months, respectively with no statistical significant difference between the results (p = 0.196). When comparing ME in the 20 eyes that achieved both results, ultrasound was more accurate than optical biometry (p = 0.002, 0.002). The factors associated with more inaccurate ME and MAE after phacovitrectomy were diabetic nephropathy and neovascular glaucoma. Conclusions: Combined phacovitrectomy in proliferative diabetic retinopathy showed small biometric errors within the tolerable range in most cases. Patients with neovascular glaucoma and diabetic nephropathy had more inaccurate postoperative refractive power. Both optical biometry and ultrasound should be used to estimate axial lengths for improving the accuracy of IOL power calculation.
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