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백내장수술에서 윤부 이완절개법과 난시교정인공수정체의 난시교정효과 비교
박유연(Yooyeon Park),김만수(Man Soo Kim),김은철(Eun Chul Kim) 대한안과학회 2017 대한안과학회지 Vol.58 No.11
목적: 한국인 백내장 환자에서 난시교정인공수정체와 윤부이완절개술의 효과를 비교하고자 하였다. 대상과 방법: 1.25D 이상의 각막난시를 보인 79명 100안에 대하여 후향적으로 고찰하였다. 난시교정인공수정체군(54안)과 윤부이완절 개술군(24안), 일반인공수정체 삽입군(대조군, 22안)으로 나누어 수술 후 2, 6개월 경과 후 나안과 교정시력, 각막난시, 굴절난시를 비교분석하였다. 또한 대상자 중 2.5D 이하의 각막난시군을 따로 중등도 난시군으로 분류하여 추가 분석을 실시하였다. 결과: 수술 2개월 후 난시교정인공수정체군의 64.8%, 윤부이완절개술군의 41.7%, 대조군의 27.3%에서 0.1 logMAR 이상 나안시력을 보였다. 각막난시의 경우 술 전후 난시교정인공수정체군은 2.40 ± 1.33D에서 2.23 ± 1.42D, 윤부이완절개술군은 1.86 ± 0.44D에서 1.29 ± 0.55D, 대조군은 1.60 ± 0.39D에서 1.35 ± 0.60D로 윤부이완절개술군에서 가장 유의한 호전을 보였다(p=0.025). 굴절난시 에서 난시교정인공수정체군은 -2.48 ± 1.84D에서 -0.98 ± 0.92D, 윤부이완절개술군은 -2.02 ± 1.03D에서 -1.65 ± 0.86D, 대조 군은 -1.69 ± 0.88D에서 -1.49 ± 0.60D의 변화를 보였으며, 변화량은 난시교정인공수정체군에서만 유의하였다(p<0.001). 2.5D 이하의 각막난시를 보인 85안 중 굴절난시는 난시교정인공수정체군에서 0.97 ± 0.66D (55.1%)의 가장 높은 호전을 보였고(p<0.001), 윤부이완절개술군에서도 0.53 ± 0.87D의 유의한 변화를 보였다(p=0.046). 결론: 두 군 모두 대조군에 비하여 월등한 시력호전 및 난시 교정 결과를 보였으나 술 전 난시의 양에 관계없이 난시교정인공수정체 삽입술에서 가장 큰 호전을 나타냈다. 중등도 난시를 가진 환자에서는 윤부이완절개법을 통하여도 유의한 양의 난시 및 시력 교정효 과를 얻을 수 있어 경제적인 문제로 난시교정인공수정체 삽입을 꺼려하는 환자에게 유용한 수술이라고 사료된다. Purpose: To compare the effectiveness of toric intraocular lens (IOL) implantation and monofocal IOL implantation with a limbal relaxing incision (LRI) for correcting astigmatism in the Korean population. Methods: The medical records of 79 patients (100 eyes) with corneal astigmatism over 1.25 diopters (D) who underwent toric IOL implantation (toric group; 54 eyes), monofocal IOL implantation with a concurrent LRI (LRI group; 24 eyes), or monofocal IOL implantation without correcting astigmatism (control group; 22 eyes), were retrospectively reviewed. For subgroup analyses, the three groups were subdivided according to preoperative astigmatic severity under 2.5 D. Visual, refractive, and keratometric outcomes were compared 2 and 6 months postoperatively. Results: The uncorrected distance visual acuity was at least 20/25 (0.1 logMAR) in 64.8%, 41.7%, and 27.3% of the toric, LRI, and control group eyes, respectively at 2 months after surgery. The toric group had the greatest refractive cylindrical error change (toric group, -2.48 ± 1.84 D to -0.98 ± 0.92 D; LRI group, -2.02 ± 1.03 D to -1.65 ± 0.86 D; control group, -1.69 ± 0.88 D to -1.49 ± 0.60 D; p < 0.001) and the LRI group showed the greatest mean corneal cylindrical error change (toric group, 2.40 ± 1.33 D to 2.23 ± 1.42 D; LRI group, 1.86 ± 0.44 D to 1.29 ± 0.55 D; control group, 1.60 ± 0.39 D to 1.35 ± 0.60 D; p = 0.025). The 85 eyes with moderate corneal astigmatism (between 1.25 D and 2.5 D) were under evaluation. The toric group showed the highest mean refractive cylindrical change (0.97 ± 0.66 D; p < 0.001), followed by the LRI group (0.53 ± 0.87 D; p = 0.046). Conclusions: Both surgical techniques significantly reduced astigmatism and had comparable visual outcomes. Toric IOL implantation was more reliable for correcting astigmatism than monofocal IOL implantation with a concurrent LRI regardless of the preoperative astigmatic severity. Both procedures were effective in reducing astigmatism in eyes with moderate corneal astigmatism. J Korean Ophthalmol Soc 2017;58(11):1225-1233
최적화된 쿼드트리를 이용한 2차원 연기 데이터의 효율적인 슈퍼 해상도 기법
최유연(YooYeon Choe),김동희(Donghui Kim),김종현(Jong-Hyun Kim) 한국컴퓨터정보학회 2021 한국컴퓨터정보학회 학술발표논문집 Vol.29 No.1
본 논문에서는 SR(Super-Resolution)을 계산하는데 필요한 데이터를 효율적으로 분류하고 분할하여 빠르게 SR연산을 가능하게 하는 쿼드트리 기반 최적화 기법을 제안한다. 제안하는 방법은 입력 데이터로 사용하는 연기 데이터를 다운스케일링(Downscaling)하여 쿼드트리 연산 소요 시간을 감소시키며, 이때 연기의 밀도를 이진화함으로써, 다운스케일링 과정에서 밀도가 손실되는 문제를 피한다. 학습에 사용된 데이터는 COCO 2017 Dataset이며, 인공신경망은 VGG19 기반 네트워크를 사용한다. 컨볼루션 계층을 거칠 때 데이터의 손실을 막기 위해 잔차(Residual)방식과 유사하게 이전 계층의 출력 값을 더해주며 학습한다. 결과적으로 제안하는 방법은 이전 결과 기법에 비해 약15~18배 정도의 속도향상을 얻었다.
Sung A Lim,Yooyeon Park,Yu Jin Cheong,Kyung Sun Na,Choun-Ki Joo 대한안과학회 2016 Korean Journal of Ophthalmology Vol.30 No.2
Purpose: High myopia is known to be a risk factor for long-term regression after laser refractive surgery. There have been few studies about the correction of moderate myopias that did not need retreatment after long-term follow-up. We evaluated 10 years of change in visual acuity and refractive power in eyes with moderate myopia after laser refractive surgery. Methods: We included patients that had undergone laser in situ keratomileusis (LASIK) or laser-assisted subepithelial keratectomy (LASEK) to correct their myopia and that had at least 10 years of follow-up. We evaluated the stability of visual acuity in terms of safety, efficacy, and refractive changes at examinations 6 months and 1, 2, 5, 7, and 10 years after surgery. Results: The study evaluated 62 eyes (36 eyes in LASIK patients and 26 eyes in LASEK patients). In both groups, the efficacy index tended to decrease, and it was consistently higher in the LASEK group compared to the LASIK group over the 10 years of follow-up. The safety index improved over 10 years and was always higher than 0.9 in both groups. The difference between the spherical equivalent at 6 months postoperatively and later periods was statistically significant after 5, 7, and 10 years in both groups (LASIK, p = 0.036, p = 0.003, and p < 0.001, respectively; LASEK, p = 0.006, p = 0.002, and p = 0.001, respectively). Ten years after surgery, 26 eyes (66.7%) in the LASIK group and 19 eyes (73.1%) in the LASEK group had myopia greater than 1 diopter. In comparison with the thickness at 6 months postoperatively, central corneal thickness was significantly increased after 5, 7, and 10 years in both LASIK and LASEK groups (LASIK, p < 0.001, p < 0.001, and p< 0.001, respectively; LASEK, p = 0.01, p < 0.001, and p < 0.001, respectively). Conclusions: Moderately myopic eyes showed progressive myopic shifting and corneal thickening after LASIK and LASEK during 10 years of follow-up. We also found that early refractive regression may indicate the long-term refractive outcome.
통증을 동반한 외전마비로 나타난 경막동맥해면정맥동루 1예
김다영(Da-Yeong Kim),박유연(Yooyeon Park),박신혜(Shin Hae Park) 대한검안학회 2019 Annals of optometry and contact lens Vol.18 No.1
Purpose: To report a case of cavernous sinus dural arteriovenous fistula who presented with painful isolated abducens nerve palsy along with the characteristic conjunctival features. Case summary: A 71-year-old female was referred to our clinic due to left eye pain and binocular diplopia. Esodeviation of 20 prism diopters was found with abduction limitation in the left eye. Slit lamp examination showed conjunctival injection, edema and corkscrew vessel dilatation in the left eye. Brain magnetic resonance angiography showed rapid filling and increased blood flow in the left superior ophthalmic vein and cavernous sinus. Cerebral angiography revealed direct venous drainage from the left cavernous sinus fistula into the left superior ophthalmic vein. After coil embolization, the left eye showed improvement in pain, conjunctival congestion and abduction limitation. Conclusions: Cavernous sinus dural arteriovenous fistula should be considered when characteristic symptoms and conjunctival signs are accompanied with painful isolated abducens nerve palsy.