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상수도 미보급 지역의 지하수 수질상태 평가를 위한 배경농도 산정방법에 관한 연구
여영도,서용교,김락현,조동준,김광식,조욱상 대한상하수도학회 2014 상하수도학회지 Vol.28 No.3
For introducing the groundwater quality assessment using background concentration of groundwater, several methods had been studied to estimate the background concentration of groundwater and to suggest the background concentration of study area. Some methods such as Box whisker plot, Percentile and Cumulative probability distribution had been adopted to estimate background concentration, and it was evaluated that the Cumulative probability distribution method presents more reasonable background concentration because it can consider the data distribution. So we estimated the background concentration of study area using cumulative probability distribution method. We suggested the background concentration for each hydrogeology respectively in case hydrogeological water quality similarity is very low.
경도의 굴절이상을 가진 기본형 간헐외사시 환자에서 수술 후 결과비교
여영도,이세엽 대한안과학회 2014 대한안과학회지 Vol.55 No.9
Purpose: To identify differences in the refractive error of postoperative intermittent exotropia patients. Methods: A total of 71 patients who had an average refractive error of 2 D and a follow-up of more than 6 months after unilateral recession-resection (R&R) for intermittent exotropia were included in this study. Patients were divided into 3 groups according to their refractive error: Group 1, ≤-1.0 D; Group 2, -1.0 D ~ +1.0 D; Group 3, ≥+1.0 D. The amounts of deviation 1 day after surgery and 6 months after surgery were evaluated. Results: Out of the 71 total patients included in this study, group 1 included 20 patients, group 2 included 39, and group 3 included 12. The average refractive error in groups 1, 2, and 3 was -2.2 ± 0.9 D, 0.0 ± 0.4 D and +1.9 ± 0.9 D, respectively. The angle of deviation 1 day after surgery was measured in the 3 groups; A result labeled ‘+’ was considered to be exodeviation and a result labeled ‘-’ was considered to be esodeviation. The angle of deviation results for groups 1, 2, and 3 one day after surgery were -6.7 ± 6.0 PD, -7.5 ± 5.8 PD and -7.3 ± 5.9 PD (p = 0.937), respectively, and the results 6 months after surgery were +2.2 ± 4.3 PD, +4.7 ± 5.9 PD and +1.8 ± 2.8 PD (p = 0.076), respectively. Among the 3 groups, no statistically significant difference was observed in postoperative angle of deviation after 6 months. Conclusions: In basic intermittent exotropia patients with an average refractive error of 2 D, the amount of refractive error makes no difference in strabismus surgical outcomes. J Korean Ophthalmol Soc 2014;55(9):1361-1365
만성중심장액맥락망막병증에서 광역학치료와 국소레이저광응고술의 치료 효과 비교
여영도(Young Do Yeo),김지현(Jee Hyun Kim),김유철(Yu Cheol Kim),김광수(Kwang Soo Kim) 대한안과학회 2016 대한안과학회지 Vol.57 No.1
Purpose: The aim of this study was to compare the treatment efficacy of photodynamic therapy (PDT) and focal laser photocoagulation in chronic central serous chorio retinopathy (CSC). Methods: A retrospective study in a clinical practice setting including 40 eyes of 40 patients with chronic CSC which were treated with PDT or focal laser photocoagulation were recruited in this study from March 2011 to December 2013. Mean change in best corrected visual acuity (BCVA), presence or absence of resolution of subretinal fluid (SRF) and pigment epithelial detachment(PED), recurrence rate, and complications were analyzed. Results: PDT was performed in 23 eyes of 23 patients and focal laser photocoagulation was performed in 17 eyes of 17 patients, and all patients were followed up for more than six months. Location of leakage point and appearance of leakage showed no statistically significant difference between the two groups. Both groups showed significant improvement in BCVA at one month and six months after the treatment; however, there was no statistically significant difference in BCVA improvement between the two groups. In both groups, SRF and PED were partially or completely resolved. Resolution of SRF was better in the PDT group at one month after the treatment; however, no statistically significant difference in the resolution period was observed between the two groups. None of the patients experienced adverse events in the PDT group, but one patient developed choroidal neovascularization after treatment in the focal laser photocoagulation group. Two patients showed recurrence in the PDT group and needed retreatment. Conclusions: Both treatments are beneficial in patients with chronic CSC. Focal laser photocoagulation can be a good treatment option in terms of cost-effectiveness and convenience.
열공망막박리에서 유리체절제술과 수정체유화술 동시 수술과 순차적 수술의 비교
최아영,여영도,김유철 대한안과학회 2015 대한안과학회지 Vol.56 No.3
목적: 수정체안 열공망막박리 환자에서 유리체절제술 및 수정체유화술을 동시에 시행한 경우와 유리체절제술 단독 시행 후 수정체유화술을 시행한 경우의 결과를 비교해 보았다. 대상과 방법: 수정체안 열공망막박리로 진단받은 환자를 유리체절제술 단독 시행 후 수정체유화술을 시행한 경우(순차적수술군)와유리체절제술과 수정체유화술을 동시에 시행한 경우(동시수술군)로 나누어 최대교정시력, 수술성공률, 수술 후 합병증을 비교하였다. 결과: 순차적수술군은 23안, 평균 나이 54.17세, 동시수술군은 16안 56.69세로 동시수술군의 평균 나이가 많았다(p=0.031). 최대교정시력(logMAR)은 순차적수술군과 동시수술군 모두에서 의미 있는 시력 상승을 나타냈으나 두 군 간 통계학적으로 유의한 차이는 없었다(p=0.592). 순차적수술군과 동시수술군 모두 일차수술의 해부학적 성공률은 100%였고, 순차적수술군 중 3안에서 백내장 수술 후 새로운 열공에 의해 망막 재박리가 발생하였다. 결론: 순차적수술군에서 새로운 열공망막박리의 빈도가 높았으나 두 군 간의 연령이 다르고 연구대상자 수가 적은 후향적 관찰연구로 열공망막박리 환자에서 새로운 열공망막박리의 위험을 줄이기 위해 단독 유리체절제술보다 유리체절제술과 백내장 동시수술이 타당하다는 결론에는 한계가 있으며 더 많은 증례로 전향적인 연구가 필요할 것으로 생각한다. Purpose: To compare the outcomes of phacovitrectomy and phacoemulsification after vitrectomy for treatment of rhegmatogenous retinal detachment (RRD). Methods: We performed a retrospective comparative analysis of 39 consecutive eyes with phakic primary RRD followed up for more than 6 months. The patients were divided into phacoemulsifcation after vitrectomy and phacovitrectomy groups. The main outcome measures were the best corrected visual acuity (BCVA), anatomical success rate and postoperative complications. Results: The mean age was 54.17 years in the phacoemulsifcation after vitrectomy group (n = 23) and 56.69 years in the phacovitrectomy group (n = 16; p = 0.031). The log MAR BCVA improved in both groups with no statistically significant difference between the 2 groups (p = 0.592). The anatomical success rate after initial surgical intervention was 100% in both groups. Retinal detachment recurred in 3 eyes in the phacoemulsifcation after vitrectomy group; caused by new retinal tear. Conclusions: The new RRD rate in phacoemulsification after vitrectomy group was higher than in the phacovitrectomy group.Due to the retrospective and limited data in this study, whether simultaneous combined cataract surgery with retinal detachment surgery should be recommended to reduce RRD risk is inconclusive and further larger, prospectively designed studies are necessary to confirm the present findings.