하측 및 상측 투명각막절개창을 이용한 백내장 수술 후 난시 변화 비교

나종경,김만수,Jong Kyung Na,Man Soo Kim 대한안과학회 2014 대한안과학회지 Vol.55 No.10

Purpose: To analyze the difference in astigmatism and the mean change in total astigmatism between inferior clear corneal incision and superior clear corneal incision following cataract surgery in surgically-induced astigmatism (SIA). Methods: Fifty-five eyes of 55 patients with with-the-rule astigmatism >0.5 diopters were evaluated. Patients were divided into two groups according to incision location (Group 1, 26 eyes with an inferior incision; Group 2, 29 eyes with a superior incision). Patients were evaluatied one month postoperatively. Uncorrected visual acuity (UCVA, log MAR), best-corrected visual acuity (BCVA, log MAR), SIA and mean change in corneal astigmatism were measured in both groups. Results: One month postoperatively, mean UCVA was 0.15 ± 0.17 log MAR in Group 1 and 0.23 ± 0.24 log MAR in Group 2 (<EM>p</EM> = 0.253). Mean BCVA was 0.08 ± 0.13 and 0.08 ± 0.12 log MAR in Groups 1 and 2, respectively (<EM>p</EM> = 0.926). The SIA was 0.50 ± 0.17 diopter and 0.57 ± 0.34 diopter (<EM>p</EM> = 0.253) and mean change in total astigmatism was 0.50 ± 0.96 diopter and 0.38 ± 0.86 diopter in Groups 1 and 2, respectively (<EM>p </EM>= 0.426). Conclusions: There was no statistically significant difference between the two groups. Thus, corneal incision on the inferior side in patients of with-the-rule astigmatism can reduce the SIA and mean change in corneal astigmatism for patients with glaucoma, hard upper eyelid tension or sunken eye. J Korean Ophthalmol Soc 2014;55(10):1470-1475

평행 와이어와 충돌하는 액적 거동에 관한 연구

나종경 ( J. K. Na ),노동환 ( D. H. Noh ),정용준 ( Y. J. Jung ),강보선 ( B. S. Kang ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.3

In this study, the behavior of the droplet colliding with parallel wires was analyzed by time-delay photography. The impact behavior modes and the critical capture speed were analyzed by changing fluids, the droplet velocity, the wire diameter and the distance between wires. Seven typical modes of impacting droplet on parallel wires were observed. The tendency of mode change was generally similar when the wire diameter was changed, but the increase of the wire diameter caused the increase of the droplet velocity at which the mode changed. The modes at the highest droplet velocity were the splitting mode when the wires were closest, the passing and splitting mode in the middle, and the passing mode when the wires were farthest apart. The critical capture speed increased as the wire diameter increased and the distance between wires decreased. The ethanol droplet showed the lowest critical capture speed.

양안 근시 환자의 단안백내장 수술 시 만족도 및 목표굴절력

정영권,나종경,김만수,Young Kwon Chung,MD,Jong Kyoung Na,MD,Man Soo Kim,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.6

Purpose: To evaluate the target refraction of patients with binocular myopia and monocular cataract after intraocular lens (IOL) implantation. Methods: This study comprised 199 patients with binocular myopia (axial length >25 mm) and monocular cataract after IOL implantation for the removal of the monocular cataract. The research was conducted using a questionnaire method and by performing statistical analysis of the refractive outcomes. Results: The patients are grouped into 3 domains (≤-3 D group, -3~-6 D group, >-6 D group). There were no statistically significant differences among the 3 groups; whereas the satisfaction of the present corrected state was statistically low in the >-6 D group (<em>p</em> < 0.05). The satisfaction of the corrected state was statistically high in the group of postoperative anisometropia under 3 D (<em>p</em> < 0.05). There was no statistical difference between the groups on the satisfaction of target diopter (-2~-3 D or emmetropia). In terms of correction method, glasses were worn in 119 patients (60%), contact lenses were worn in 26 patients (13%), and monovision was used in 14 patients (7%) were used respectively. Forty patients (20%) with implanted IOL in both eyes did not use any of the correction methods above. Except for the contact lens group, the general satisfaction and the satisfaction of the present corrected state were statistically lower than the other group (<em>p</em> < 0.05). There was no statistically significant difference among the 3 groups in the percentage of cataract surgery in the fellow eye. Conclusions: There was no statistical difference between the groups in satisfaction of target diopter (-2~-3 D or emmetropia). Setting the target refraction difference between both eyes less than 3 D leads to more satisfactory outcomes. J Korean Ophthalmol Soc 2014;55(6):817-825

가정봉사원 파견서비스 프로그램 성과에 관한 연구

오세윤,나종경 한국행정학회 2007 한국행정학회 학술발표논문집 Vol.2007 No.-

Detecting the Progression of Normal Tension Glaucoma: A Comparison of Perimetry, Optic Coherence Tomography, and Heidelberg Retinal Tomography

윤재윤,나종경,박찬기 대한안과학회 2015 Korean Journal of Ophthalmology Vol.29 No.1

Purpose: We compared the abilities of Stratus optical coherence tomography (OCT), Heidelberg retinal tomography (HRT) and standard automated perimetry (SAP) to detect the progression of normal tension glaucoma (NTG) in patients whose eyes displayed localized retinal nerve fiber layer (RNFL) defect enlargements. Methods: One hundred four NTG patients were selected who met the selection criteria: a localized RNFL defect visible on red-free fundus photography, a minimum of five years of follow-up, and a minimum of five reliable SAP, Stratus OCT and HRT tests. Tests which detected progression at any visit during the 5-year follow-up were identified, and patients were further classified according to the state of the glaucoma using the mean deviation (MD) of SAP. For each test, the overall rates of change were calculated for parameters that differed significantly between patients with and without NTG progression. Results: Forty-seven (45%) out of 104 eyes displayed progression that could be detected by red-free fundus photography. Progression was detected in 27 (57%) eyes using SAP, 19 (40%) eyes using OCT, and 17 (36%) eyes using HRT. In early NTG, SAP detected progression in 44% of eyes, and this increased to 70% in advanced NTG. In contrast, OCT and HRT detected progression in 50 and 7% of eyes during early NTG, but only 30 and 0% of eyes in advanced NTG, respectively. Among several parameters, the rates of change that differed significantly between patients with and without progression were the MD of SAP (p = 0.013), and the inferior RNFL thickness (p = 0.041) and average RNFL thickness (p = 0.032) determined by OCT. Conclusions: SAP had a higher detection rate of NTG progression than other tests, especially in patients with advanced glaucoma, when we defined progression as the enlargement of a localized RNFL defect. The rates of change of the MD of SAP, inferior RNFL thickness, and average RNFL thickness differed between NTG patients with and without progression.

수술 후 마비성 동공 산대를 유발하는 원인 분석 및 분류

김용찬,나종경,김만수,Yong Chan Kim,Jong Kyung Na,Man Soo Kim 대한안과학회 2015 대한안과학회지 Vol.56 No.1

Purpose: To seek for mechanisms to prevent fixed dilated pupil including Urrets-Zavalia syndrome after intraocular surgery by analyzing and classifying the causes of such cases. Methods: Medical records and anterior segment photographic images of patients with fixed dilated pupil who underwent penetrating keratoplasty, lamellar keratoplasty, or cataract surgery were analyzed in a retrospective manner from April, 1984 to February, 2014. Results: Among 15 cases of postoperative fixed dilated pupil, 8 eyes of keratoconus eyes had received penetrating keratoplasty done and 7 eyes with ocular disorders other than keratoconus underwent intraocular surgeries. In cases 1 and case 2, which received penetrating keratoplasty for keratoconus, dilated pupil with regular pupil border, iris atrophy, and secondary glaucoma occurred; these cases were classified as group 1 and diagnosed as Urrets-Zavalia syndrome. Cases from 3 to 8 which also received penetrating keratoplasties due to keratoconus, irregularly dilated pupil, severe iris atrophy, posterior synechiae after moderate to severe inflammation in the anterior chamber, and fibrotic membrane on the anterior capsule occurred; these cases were classified as group 2. Finally, cases 9 to 15, which had mild inflammation, no fibrotic membrane, and regularly fixed dilated pupil after receiving other intraocular surgeries were classified as group 3. Conclusions: Differences exist between definite Urrets-Zavalia syndrome and postoperative fixed dilated pupil with regards to regularity of pupillary margin, degree of iris atrophy, posterior synechiae, fibrotic membrane, and posterior subcapsular opacity. Therefore, a new classification of fixed dilated pupil after intraocular surgery which addresses these characteristics is required and various trials to prevent the adverse postoperative complications of fixed dilated pupil should be performed. Preventive measures may include careful control of intraocular pressure, restricting atropine use, completely removing of viscoelastics, and minimal air or gas injection. J Korean Ophthalmol Soc 2015;56(1):47-54