펨토초레이저 백내장수술에서 활모양각막절개술 시행의 장기간 임상결과
Long-term Results of Arcuate Keratotomy in Femtosecond Laser-assisted Cataract Surgery
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목적: 펨토초레이저 백내장수술에서 활모양각막절개술을 시행받은 환자의 장기간 임상결과를 알아보고자 한다. 대상과 방법: 수술 전 각막난시 0.5 diopter (D) 이상의 78명 환자 99안을 대상으로 후향적으로 연구하였다. 수술 전과 수술 후 2년간 나안과 교정시력, 각막난시, 고위수차를 비교 분석하였고 Alpins method를 이용해 난시교정 효과를 분석하였다. 결과: 수술 전 평균 나안시력과 교정시력은 각각 0.55 ± 0.31 logarithm of minimal angle of resolution (logMAR), 0.33 ± 0.26 logMAR이었고, 수술 2년 후 0.13 ± 0.19 logMAR, 0.07 ± 0.09 logMAR로 유의한 시력 상승을 보였다(p<0.001, p<0.001). 각막난시는 수술 전 -1.15 ± 0.66D에서 수술 1, 2일 후 -0.79 ± 0.38D로 유의하게 개선된 후(p<0.001) 2년간 유의한 변화 없이 유지되었다. 수술 전 평균 target induced astigmatism은 1.15 ± 0.66D였고, 수술 2년 후의 평균 surgically induced astigmatism과 difference vector는 각각 0.69 ± 0.43D, 0.83 ± 0.48D였으며 평균 correction index는 0.68 ± 0.45였다. 4 mm, 6 mm 총 고위수차와 6 mm 트레포일수차에서는 수술 전과 비교해 수술 2개월 후 유의한 변화를 보였지만(p=0.001, p=0.001, p=0.004), 나머지 영역에서는 유의성 있는 차이를 관찰할 수 없었다. 결론: 펨토초레이저 백내장수술과 동시에 시행되는 활모양각막절개술은 중등도 미만의 난시를 교정할 수 있는 안전하고 효과적인 방법이다.
Abstract
Purpose: To investigate the long-term follow-up results of arcuate keratotomy in femtosecond laser-assisted cataract surgery. Methods: The medical records of 78 patients (99 eyes) with corneal astigmatism >0.5 diopters (D) who underwent arcuate keratotomy concurrent with femtosecond laser-assisted cataract surgery were retrospectively reviewed. Uncorrected and corrected visual acuities and keratometric and higher order aberration outcomes were compared preoperatively and 2 years postoperatively. Results: The mean uncorrected visual acuities and corrected visual acuities changed from 0.55 ± 0.31 D and 0.33 ± 0.26 D, preoperatively to 0.13 ± 0.19 D and 0.07 ± 0.09 D, 2 years postoperatively. The mean preoperative corneal astigmatism was -1.15 ± 0.66 D. This was reduced to -0.79 ± 0.38 D at 1-2 days after surgery (p < 0.001), followed by no significant change for 2 years. The mean target-induced astigmatism was 1.15 ± 0.66 D preoperatively, and the mean surgically-induced astigmatism and difference vector were 0.69 ± 0.43 D and 0.83 ± 0.48 D, 2 years postoperatively. The mean correction index was 0.68 ± 0.45, 2 years postoperatively. There was no significant difference in higher order aberrations except 4 mm and 6 mm total higher order aberrations and 6 mm trefoil between preoperatively and 2 years postoperatively. Conclusions: Arcuate keratotomy concurrent with femtosecond laser-assisted cataract surgery is a safe and effective way to reduce corneal astigmatism which remained stable over 2 years of follow-up with below moderate astigmatism.
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