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인트라라식 후 빛간섭단층촬영계로 측정한 각막절편 두께의 재현성 평가
김희중,오세훈,이도형,이종현,이강일,김진형,Hee Jung Kim,Sae Hoon Oh,Do Hyung Lee,Jong Hyun Lee,Kang Il Rhee,Jin Hyoung Kim 대한안과학회 2007 대한안과학회지 Vol.48 No.12
Purpose: To investigate the relationship among optical coherence tomography (OCT), ultrasound pachymetry, and Orbscan in central corneal thickness measurement and to evaluate the reproducibility of flap thickness using an IntraLase femtosecond laser. Methods: Central corneal thickness was measured by OCT, ultrasound pachymetry, and Orbscan in 59 eyes of 30 patients before LASIK. After IntraLASIK, the corneal flap thickness measured using OCT was compared with the intended corneal flap thickness. Results: Central corneal thickness measured by OCT was thinner than that measured by other instruments preoperatively, but there was no significant difference among these methods (p>0.01), and corneal thickness values obtained by ultrasound pachymetry and Orbscan correlated well with those obtained by OCT (r ranged from 0.804 to 0.889, p<0.01). After IntraLASIK, there was no significant difference between the mean measured flap thickness and the intended flap thickness (p>0.01). Conclusions: OCT is a relatively accurate instrument for measuring corneal thickness and can easily measure the corneal flap thickness after LASIK. Compared with the results of a previous study, the mean measured flap thickness in this study was more reproducible with the IntraLase femtosecond laser.
차영동,오세훈,이도형,Young Dong Cha,Sae Hoon Oh,Do Hyung Lee 대한안과학회 2006 대한안과학회지 Vol.47 No.5
Purpose: To assess the clinical results of various acrylic intraocular lenses (IOLs) after cataract surgery with respect to the tilting and decentration of IOLs, postoperative high-order (HO) aberration, and duration to gain of refractive stability. Methods: This prospective study comprised 60 eyes of 53 patients after uneventful cataract surgery with IOLs implantation. Patients were randomized into four groups of 15 eyes each based on IOLs type: MA60BM, SA60AT, AR40e, or Akreos. We analyzed the extent of IOL decentration, tilting and the difference between preoperative predictive refraction and postoperative actual refraction at 1 day, 1 week, 1 month and 2 months after surgery. The postoperative HO aberration was determined at 2 months after surgery. Results: The extent of IOL decentration and tilting was not statistically significant among any of the groups (p>0.05). The spherical aberrations, the triangular coma aberrations and HO RMS values were, however, statistically significantly different among the groups (p<0.05). Refractive stability was gained by 2 months in all four groups, but the four IOLs differed in the time to refractive stability: 2 months in the MA60BM group, 1 month in the SA60AT group, 1 day in the AR40e group, and 1 week in the Akreos Adapt group. Conclusions: All four acrylic IOLs provided satisfactory postoperative results, but there were differences in the time to gain of refractive stability and HO aberration between the four IOLs. These results suggest that a surgeon could achieve a better clinical outcome after cataract surgery by selecting the most suitable IOL for his intention.
백내장 수술 후 예상시력에 대한 망막시력계의 정확성 및 유의성
박정일,오세훈,김진형,문상웅,이도형.Jung Il Park. M.D.. Sae Hoon Oh. M.D.. Jin Hyung Kim. M.D.. Sang Woong Moon. M.D.. Do Hyung Lee. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.7
Purpose: To investigate the accuracy and usefulness of the retinal acuity meter (RAM) in predicting visual acuity after cataract surgery. Methods: We randomly selected 47 eyes from 43 patients who underwent cataract surgery in our clinic. Preoperative BCVA and 3 month postoperative BCVA were measured by the Snellen chart, and we recorded the preoperative visual acuity by RAM. We also grouped the patients according to diabetic retinopathy and preoperative BCVA 20/100. By comparing the expected visual acuity by RAM with actual postoperative BCVA values, we analyzed the accuracy of the RAM`s predictability after surgery. The cataract types and macular disease were taken under consideration when analyzing our results. Results: Of the 47 eyes in our study, the postoperative Snellen visual acuity was predictable within three lines (90.9%) in 11 eyes with diabetic retinopathy and without macular disease. In the 36 eyes without diabetic retinopathy, the postoperative Snellen visual acuity was predictable within three lines (91.6%) of the cases. In both groups, the preoperative RAM acuity and postoperative BCVA were significantly correlated (R2=0.692, R2=0.812, p<0.05). In 41 eyes with preoperative BCVA 20/100 or more, the postoperative Snellen visual acuity was highly predictable in 95.1% (R2=0.763, p<0.05). However, in 6 eyes with preoperative BCVA levels less than 20/100, the postoperative Snellen visual acuity was not predictable (66.6 %). In the patients with both nucleosclerosis and posterior subcapsular opacity and in the patients with additional cortical opacity, the postoperative BCVA differed from the preoperative RAM acuity by more than three lines on the Snellen chart. Conclusions: RAM is useful in predicting postoperative visual acuity in cataract patients, but may be unreliable in the patients with combined cataract forms or with preoperative BCVAs less than 20/100.
미세 절개 및 고전적 백내장 수술에서의 수술 유발 난시 및 각막 고위 수차 비교
황상조,최석규,오세훈,이종현,김진형,이도형,Sang Jo Hwang,Suk Kyue Choi,Sae Hoon Oh,Jong Hyun Lee,Jin Hyoung Kim,Do Hyung Lee 대한안과학회 2008 대한안과학회지 Vol.49 No.10
Purpose: To compare surgically induced astigmatism (SIA) and some corneal higher order aberrations in patients who underwent microcoaxial cataract surgery (MCCS) or conventional cataract surgery. Methods: A prospective randomized study included 60 eyes of 55 patients. Thirty eyes received MCCS using a 2.2mm clear corneal incision (group 1), and 30 eyes received conventional cataract surgery using a 2.8 mm clear corneal incision (group 2). SIA and corneal higher order aberrations were measured with a Keratometer (Humphrey, Zeiss) and i-Trace (Tracey Technologies) preoperatively, and at 1 and 3 months after cataract surgery. SIA was analyzed vectorially using the Alpins method. Results: There was no significant difference in preoperative UCVA or BCVA between the two groups. At 1 month and 3 months after surgery, SIA in group 1 was less than that in group 2, but this difference was not significant. There was no statistically significant difference in postoperative change of corneal higher order aberrations in each group at 1 month or 3 months after surgery, and there was no statistically significant difference in corneal higher order aberrations between the two groups preoperatively, at 1 month, or 3 months after surgery. Conclusions: There was no significant difference in SIA and corneal higher order aberrations between the two groups. J Korean Ophthalmol Soc 2008;49(10):1597-1602
초음파 피로시험법을 이용한 엔지니어링 플라스틱(Polyoxymethylen ; POM)의 내구성 평가
조인식(In Sik Cho),황정호(Jung Ho Hwang),오주연(Joo Yeon Oh),김현창(Hyun Chang Kim),오세훈(Sae Hoon Oh),이창순(Chang Soon Lee),박인규(In Gyu Park) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.8
엔지니어링 플라스틱(Engineering Plastic ; EP)에 대한 내구성 평가를 위해 현재 새롭게 국내에서 개발한 초음파 피로시험법을 이용하여 EP 중에서도 결정화 속도가 빠르고 결정화도가 높은 범용 POM(Polyoxymethylene) 소재에 대한 초음파 가속피로시험 거동을 평가하고자 하였다. 이에 본 연구에서 사용된 POM 소재의 밀도는 1.37 g/㎤, 동탄성계수는 3.49 GPa 로 측정되었으며, 초음파피로시험 20kHz, 응력비 R= -1 의 판상시편 두께 (4t, 7t, 10t)에 따른 피로수명평가 결과 전체 응력진폭 5.0~6.0MPa 부위에서 피로한도를 확인하였다. 피로시험 후 파단 면을 관찰한 결과 7t, 10t 두께 시편의 크랙 시작위치에서 미소 공동들이 서로 연결된 형태의 잔금(crazing) 균열현상으로 파단된 dimple 구조형상을 전자현미경을 통해 확인할 수 있었다. In this study, a newly developed ultrasonic fatigue test was performed for durability assessment of polyoxymethylene engineering plastic, which has a high crystallization rate and degree of crystallization. Fatigue strength of POM (polyoxymethylene) was performed on a piezoelectric UFT developed by Mbrosia Co., Ltd(1), operating at a high frequency of 20 kHz. The test results showed a fatigue limit of 5.0~6.0 MPa under fatigue testing at R = -1, 20kHz; and, electron microscopy revealed the size effect by risk volume and fractured dimple structure after the coalescence of micro-voids through the crazing effect, which occurs during the failure of a polymer.