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- 저자 : 차흥원(Hung Won Tchah) (검색결과 69 건)
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레이져 레이 트레이싱 방식 수차계와 쉑-하트만 방식 수차계의 임상 비교
정진호, 김명준, 차흥원Jin Ho Jeong M.D. Myoung Joon Kim M.D. Hung Won Tchah M.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.12
Purpose: To compare ocular aberrations measured with a laser ray tracing aberrometer (iTrace?, Tracey technology) or a Shack-Hartmann aberrometer (ZywaveTM, Bausch & Lomb). Methods: A total of 68 eyes were included in this study. After manifest refraction (MR) and pupil dilation, aberrations and phoroptor predicted refraction (PPR) were measured with the ZywaveTM and iTrace? devices. The study group was subdivided into a more myopic group (<-4.33 Diopter (D)) and a less myopic group (>-4.33 D). The root mean square (RMS) errors of the total high order, spherical, coma and 3rd~5th order aberrations were compared. Results: The mean and SE of MR was -4.33±2.03 diopter (D), and that of the PPR was -4.20±2.13 D in iTrace? and -4.42±2.23 D in ZywaveTM. A paired-t test of the PPR and MR indicated that they were not statistically different. Zernike coefficients were expressed in the opposite sign in the 2nd and 4th order. The coma and spherical aberrations were larger in ZywaveTM. In a scattergram of each Zernike coefficient, the coefficient of determination (R2) was very low with higher order aberrations, with an exception for coma and spherical aberrations. The correlation of RMS error was greater in the less myopic group. Conclusions: Taking PPR values as a good reference of MR was a reliable method. For the HOA, only coma and spherical aberrations showed good correlations between ZywaveTM and iTrace?, and the correlations for HOA were decreased for the high myopic eyes.
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인공수정체 탈구에서 수술방법의 차이에 따른 술 후 결과 비교
선재홍, 김재용, 김명준, 윤영희, 차흥원Jae Hong Sun MD Jae Yong Kim MD Myoung Joon Kim MD Young Hee Yoon MD Hung Won Tchah MD 대한안과학회 2014 대한안과학회지 Vol.55 No.2
Purpose: To compare clinical outcomes of various surgical methods of intraocular lens dislocation correction surgery. Methods: We retrospectively analyzed the medical records of patients who underwent intraocular lens dislocation correction surgery with and without vitrectomy by two seasoned surgeons, and compared postoperative best corrected visual acuity and spherical equivalent. Clinical outcomes of secondary intraocular lens insertion after primary intraocular lens removal and primary intraocular lens reposition were compared among the cases without vitrectomy. Results: Dislocated intraocular lens correction without vitrectomy showed better postoperative visual acuity compared to procedures with vitrectomy (0.35 ± 0.37 vs. 0.54 ± 0.18; t-test, p = 0.001), but there were no significant differences in spherical equivalent (1.30 ± 1.10 vs. 1.80 ± 1.57; p = 0.24) between cases with and without vitrectomy. In comparing primary intraocular lens reposition and secondary intraocular lens insertion among the cases without vitrectomy, the outcomes did not show significant differences in best corrected visual acuity (0.28 ± 0.40 vs. 0.40 ± 0.37; p = 0.38) or spherical equivalent (1.66 ± 1.43 vs. 1.07 ± 0.79; p = 0.19). In comparing secondary intraocular lens insertion into the capsular bag and fixation to the sclera, iris and iris sulcus, the outcomes did not show significant differences in best corrected visual acuity (p = 0.49) or spherical equivalent (p = 0.33). Conclusions: The various intraocular lens correction methods examined did not show clinically significant differences in best corrected visual acuity and spherical equivalent when performed by experienced surgeons, except for better postoperative best corrected visual acuity in cases without vitrectomy compared to cases with vitrectomy. J Korean Ophthalmol Soc 2014;55(2):196-201
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전안부 빛간섭단층촬영으로 측정한 백내장 수술 후 전방깊이와 전방각의 변화
신철진, 이주은, 김재용, 차흥원Chul Jin Shin MD Joo Eun Lee MD Jae Yong Kim MD PhD Hung Won Tchah MD PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.3
Purpose: To evaluate changes in anterior chamber depth (ACD) and angle after phacoemulsification and intraocular lens implantation using anterior segment optical coherence tomography (AS-OCT). Methods: Seventy-eight eyes of 69 patients had uneventful phacoemulsification and IOL implantation using a clear corneal incision. Anterior segment OCT images of nasal and temporal angle quadrants were obtained before and at one month after surgery. The angle-referenced (ACD1), pupil-referenced (ACD2), lens-referenced (ACD3) ACDs, crystalline lens rise (CLR), nasal and temporal iridocorneal angles, angle opening distance at 500 μm (AOD500), and trabecular iris surface area at 750 μm (TISA750) were measured. Preoperative and postoperative measurements were compared using paired sample t-tests. Results: The mean ACD1 was 3.19±0.24 mm preoperatively and 3.22±0.21 mm at one month postoperatively (P=0.21); ACD2 was 2.99±0.40 mm preoperatively and 3.56±0.28 mm at one month postoperatively (P<0.05); ACD3 was 2.75±0.41 mm preoperatively and 4.00±0.27 mm at one month postoperatively (P<0.05). The mean iridocorneal angles, AOD500, and TISA750 for both nasal and temporal sides increased significantly at the postoperative examinations (P<0.05). Conclusions: Changes in anterior chamber angle after cataract surgery can be objectively quantified by anterior segment OCT. Deepening of the anterior chamber and widening of the nasal and temporal angles after cataract extraction were shown on AS-OCT. J Korean Ophthalmol Soc 2010;51(3):353-358
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초음파 백내장쪼개기와 작은 백내장쪼개기에 의한 백내장 수술의 비교
김덕수, 김명준, 김재용, 차흥원Deok-Soo Kim M.D. Myoung-Joon Kim M.D. Jae-Yong Kim M.D. Hung-Won Tchah M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.11
Purpose: To compare effective phacoemulsification time (EPT), the severity of corneal swelling and corneal endothelial cell density after cataract surgery between the phaco chop method and the mini chop method. Methods: Cataract surgery was performed by phaco chop (15 eyes) or by mini chop (13 eyes) method in 28 eyes of 27 patients. The nuclear opacity of cataract grade was more than 5 on LOCS (Lens opacities classification system) III. EPT and the amount of irrigated BSS solution were measured during the operation. Corneal thickness (preoperative, immediate postoperative, postoperative 1 day, 1 week, 1 month, and 3 months) and corneal endothelial cell density (preoperative, postoperative 1month and 3 months) were measured. Results: The EPT of phaco chop group was 5.2 sec and that of mini chop was 1.0 sec (p=0.000). The amount of irrigated BSS was 193.7 ml and 170.4 ml in the phaco chop group and the mini chop group, respectively. The increase in corneal thickness was 3.2% and 0.9% at immediately after surgery (p=0.128), 19.0% and 10.5% at postoperative 1 day (p=0.088), 5.7% and 1.5% at postoperative 1 week (p=0.080), 0% and -1.3% at postoperative 1 month (p=0.717), and -0.4% and -0.6% at postoperative 3 months (p=0.890) in the phaco chop group and the mini chop group, respectively. Corneal endothelial cell density decreased 23.0% in the phaco chop group and 9.4% in the mini chop group at postoperative 1 month (p=0.005) and 22.9%, 12.6%, at 3 months respectively (p=0.036). Conclusions: The mini chop technique reduced permanent endothelial cell damage in comparison with the phaco chop method and might be more effective in decreasing corneal swelling during the early postoperative period than the phaco chop method.
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