Perioperative Modulating Factors on Astigmatism in Sutured Cataract Surgery

Yang Kyeung Cho,Man Soo Kim 대한안과학회 2009 Korean Journal of Ophthalmology Vol.23 No.4

Purpose: To evaluate the factors that affect postoperative astigmatism and post-suture removal astigmatism, and to evaluate the risk factors associated with astigmatism axis shift. Methods: We performed a retrospective chart review of 130 eyes that had undergone uneventful phacoemulsification cataract surgery. Preoperative astigmatism was divided into four groups (Groups I, II, III, and IV) according to the differences between the axis of preoperative astigmatism (flattest axis) and the incision axis (105 degrees). We analyzed the magnitude and axis of the induced astigmatism after the operation and after suture removal in each group. We also analyzed the factors which affected the postoperative astigmatism and post-suture removal astigmatism in each sub-group of Groups I, II, III, and IV, excluding postoperative or post-suture removal axis shift (specifically, Group I(WAS), II(WAS), III(WAS), and IV(WAS)). We identified the variables associated with the prevalence of postoperative astigmatism axis shift and those associated with the prevalence of post-suture removal axis shift. Results: An increase in the magnitude of postoperative astigmatism was associated with an increase in the preoperative magnitude of astigmatism in Groups I(WAS), II(WAS), and III(WAS) (p<0.05), and with an increase in the corneal tunnel length in Group I(WAS). A decrease in the magnitude of postoperative astigmatism was associated with an increase in the corneal tunnel length in Groups III(WAS) and IV(WAS) (p<0.05). An increase in the magnitude of post-suture removal astigmatism was associated with an increase in the magnitude of postoperative astigmatism in Groups I(WAS) and IV(WAS) (p<0.05), and with late suture removal in Group IV(WAS) (p<0.05). A decrease in the magnitude of post-suture removal astigmatism was associated with late suture removal in Groups I(WAS) and II(WAS). A logistic regression analysis showed that the prevalence of post- suture removal astigmatism axis shift was associated with increased corneal tunnel length, decreased magnitude of postoperative astigmatism, and early suture removal. Conclusions: In order to reduce postoperative and post-suture removal astigmatism, we recommend a short corneal tunnel length and late suture removal in patients with Group I(WAS) characteristics, late suture removal in Group II(WAS)-like patients, long corneal tunnel length in Group III(WAS)-like patients, and long corneal tunnel length and early suture removal in patients with characteristics of Group IV(WAS).

Original Article : Anterior Segment Parameters Using Pentacam and Prediction of Corneal Endothelial Cell Loss after Cataract Surgery

( Yang Kyeung Cho ),( Hwa Seok Chang ),( Tae Yoon La ),( Dong Hyun Ji ),( Hyun Kyung Kim ),( Jin A Choi ),( Man Soo Kim ) 대한안과학회 2010 Korean Journal of Ophthalmology Vol.24 No.5

Purpose: We evaluated various preoperative anterior segment parameters measured with a Pentacam rotating Scheimpflug camera and compared them with those of conventional methods. We also evaluated the effect of different parameters on corneal endothelial cells after cataract surgery. Methods: Pentacam examination was performed in 88 eyes from 88 patients to evaluate central anterior chamber depth (ACDpentacam), nuclear density (Densitometrypentacam), anterior chamber volume (ACV), and lens thickness (LTpentacam). We compared values of ACDpentacam with those of ultrasound (ACDsono) and also compared Densitometrypentacam values with those of Lens Opacities Classification System (LOCS III) classification. We evaluated the effect of the following preoperative values measured with Pentacam on postoperative endothelial cell loss: pupil size measured both preoperatively and before capsulorrhexsis (PupilCCC), amount of viscoelastics, and LT measured by ultrasound (LTsono). Results: A significant concordance was found between the two grading methods of nuclear opacity: Densitometrypentacam and LOCS III classification (τb=0.414, p=0.000). We also found a positive correlation between ACDpentacam and ACDsono (r=0.823, p=0.000) and between ACDpentacam and ACV (r=0.650, p=0.000). There were significant differences between the results of LTpentacam and LTsono. The final regression model identified Densitometrypentacam, viscoelastics and PupilCCC as independent predictors of decreased postoperative corneal endothelial cell density (CD) at postoperative day 3, and Densitometrypentacam, viscoelastics, and ACV as independent predictors of decreased CD two months postoperatively (p<0.05). Conclusions: Good agreement was found between all results obtained with the Pentacam and conventional methods except LT. Analyzing anterior chamber parameters preoperatively using Pentacam could be helpful to predict postoperative endothelial cell loss.

축성 근시가 당뇨망막병증의 빈도와 진행에 미치는 영향

조양경 ( Yang Kyeung Cho ),곽노훈 ( No Hoon Kwak ) 대한안과학회 2002 대한안과학회지 Vol.43 No.7

각막 보존액에 첨가된 소수성분과 성장인자의 효과

조양경 ( Yang Kyeung Cho ),김만수 ( Man Soo Kim ) 대한안과학회 2003 대한안과학회지 Vol.44 No.4

백내장 수술후 안검하수 발생에 관한 고찰

조양경(Yang Kyeung Cho),김현승(Hyun Seung Kim),이영춘(Young Chun Lee) 대한안과학회 2000 대한안과학회지 Vol.41 No.9

단안의 시력감소과 비전형적인 시야장애를 보인 뇌하수체 종양 1예

조양경(Yang Kyeung Cho) 대한검안학회 2011 Annals of optometry and contact lens Vol.10 No.1

목적: 뇌하수체 종양의 임상양상이 단안의 시력과 시야장애를 보이는 경우는 드물며 본 증례와 같은 비전형적인 시야장애를 보이는 경우는 국내에 보고된 바가 없어서 저자들은 1예를 보고하고자 한다. 대상과 방법: 65세 남자가 약 2개월 전부터 진행되는 우안의 시력장애를 주소로 내원하였다. 시력은 우안의 교정시력이 0.32였고 좌안의 교정시력이 0.6이었다. 양안의 경도의 백내장이 관찰되었으나 안저검사 및 시신경에서는 특이한 이상이 없었고, 좌안은 전혀 시력이나 시야장애를 호소하지 않았다. 반복된 시력검사와 시야검사, 시유발전위검사에서 점점 악화되는 양상을 보여 우측 구후 시신경염이나 시신경의 종양을 의심하고 안와 전산화 단층촬영을 실시하였다. 우측 안구 및 시신경에는 이상소견이 없었으나 몇 개의 단층에서 뇌하수체의 비정상적인 음영을 관찰하여 뇌자기공명영상을 다시 하여 뇌하수체 종양으로 확진되었다. 환자는 신경외과의 절제 수술 후 경과관찰 중이다. 결과: 뇌하수체 종양은 다양한 임상양상과 시야변화를 보일 수 있으나 단안에 국한된 주증상을 보이는 경우는 매우 드물며 본 증례와 같은 시야결손을 보이는 경우는 안과 의사의 진단이 매우 중요할 것으로 사료된다. Purpose: We report a rare case of pituitary tumor showing decreased visual acuity and atypical visual field defect in one eye. Methods: A 65-year-old patient presented with decreasing visual acuity in right eye. There were mild cataratous change of lens in both eyes and no abnormal findings of retina and optic nerve in fundus examination except mild epiretinal membrane in left eye. And there showed an atypical constricted visual field and abnormal wave in visual evoked potential in right eye. Orbit CT was done to observe optic nerve lesion but there was no abnormality in optic nerve. But we found an abnormal enhancement in pituitary gland. Pituitary tumor was confirmed in brain MRI and the patient was undergone neurosurgical excision of tumor. Results: Pituitary tumor shows variable clinical signs and visual field defect. But signs confined to unilateral eye is rare and visual field defect such as our case is atypical. So ophthalmologists need more attention in diagnosis of patients with atypical visual field defect.

Mating Disruption of Grapholitha molesta(Lepidoptera: Tortricidae) by Synthetic Sex Pheromone in Pear Orchards

Yang Chang-Yeol,Han Kyeung-Sik,Jung Jin-Kyo,Boo Kyung-Saeng,Kim Ki-Yeol,Cho Hyun-Mo 한국응용곤충학회 2000 한국응용곤충학회 학술대회논문집 Vol.2000 No.1

보호회로가 탄성적으로 부착된 전지 팩

조경호(Cho, Kyeung-Ho),양해술(Yang, Hae-Sool) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.7

디지털 컨버전스로 대표되는 모바일 기기의 진화에 따라 카메라, MP3, TV, 게임기 등의 기능이 휴대폰에 탑재되었으며, 이에 따른 모바일 기기의 소비전력 증가는 차세대 초고용량 리튬이온전지의 개발을 촉진시키고 있다. 또한 환경 규제 및 유가 상승으로 인하여 하이브리드 자동차에 대한 수요가 증가하고 있고, 이에 따라 중대형 전지에 대한 관심이 집중되면서 전지의 저가격화, 고출력화, 고안전화를 이루기 위한 노력이 계속되고 있다. 본 연구에서는 리튬이온전지 패킹에 관한 기술로서 공정축소 및 생산성을 향상시킬수 있고 전지본체 CELL을 제외한 나머지 부품을 재활용 할 수 있는 특허기술을 제시하였다. 보호회로가 탄성적으로 부착된 리튬이온전지 팩은 보호회로와 전지본체의 순간적인 단락을 방지하고, 보호회로와 전지본체의 전기적인 연결을 용이하게 수행할 수 있도록 탄성적으로 부착된 전지 팩을 제공한다. As mobile devices evolve and digital convergence trend is here to stay, mobile phones are built with multiple functions including cameras, MP3s, TVs and game consoles. As a consequence, such multi-functional mobile phones come to spend more power, facilitating development of next-generation ultra-capacity lithium ion battery. In addition, environmental regulations and rising oil prices cause demand for hybrid cars to keep rising. Accordingly, more and more attention is being paid to medium and large batteries and more efforts are being made to realize lower battery prices, higher outputs and stability. This study presented a patent technology related to the lithium ion battery packing that allows reducing processes related, increasing productivity and recycling parts other than the body. The lithium ion battery pack to which protection circuits are elastically attached provides short circuit protection for the circuit and the body and makes electric connection of the circuit and the body easier.

Analysis of Genetic Variation of Perilla frutescens var. crispa Germplasm Using RAPD

Hyeun-Kyeung Kim(김현경),Young-Son Cho(조영손),Jae-Wan Yang(양재완),Young-Whan Choi(최영환),Jun-Soon Kang(강점순),Yong-Jae Lee(이용재),Beung-Gu Son(손병구) 한국생명과학회 2010 생명과학회지 Vol.20 No.1

본 연구는 차조기 유전자원의 유전적 특성 분석을 위해 차조기 유전자원의 유전적 변이를 DNA 수준에서 비교하고, 이들의 유전적 근연성 및 변이정도를 규명하여 유전 및 육종의 기초자료를 제공하기 위하여 수행한 연구의 결과로서, RAPD를 이용하여 국내에서 수집한 차조기 유전자원의 DNA polymorphism을 관찰한 결과 80개의 primer 중에서 22개의 변별력 있는 primer가 선발되었고 이들 22개의 primer는 총 224개의 band가 나타났으며, 이중에서 polymorphic band는 127개 이었다. UPGMA에 의한 유사도 계수는 0.72~0.94 이었고, 유사도계수 matrix를 이용한 유연관계의 분석 결과 차조기 유전자원 22계통은 하나의 큰 그룹과 하나의 작은 그룹을 형성하였다. 그리고 NTSYS에 의한 유연관계 분석의 결과와 생육특성인 개화기, 성숙기, 경장, 분지수, 마디수와 화방군장 및 삭수와의 밀접한 관련성은 확인하지 못하였다. Genetic variations of Chajogi (Perilla frutescens var. crispa) germplasms were investigated by using RAPD markers. Twenty-two Perilla frutescens var. crispa lines collected from various locations were subjected to RAPD analysis using 80 primers. Among them, only 22 primers showed polymorphic bands and these 22 primers provided a total of 224 bands consisting of 127 polymorphic and 97 monomorphioc bands. The polymorphic bands were subjected to phylogenetic analysis using the UPGMA method. From UPGMA, similarity co-efficiency of 22 Chajogi lines ranged from 0.72 to 0.94. The dendrogram of 22 lines obtained through the UPGMA method resulted in two groups (one major group and one minor group). Although the two groups were roughly consistent with growth phenotypes (period of flowering, period of maturity, stem length, number of branches, number of nodes, number of flower clusters and number of ovaries) in detail, much inconsistency also was present.

전층각막이식후 초음파유화흡인술의 결과

조양경,김만수,Yang Kyeung Cho,M,D,Ph,D,Man Soo Kim,M,D,Ph,D 대한안과학회 2007 대한안과학회지 Vol.48 No.2

Purpose: To evaluate the factors that affect visual outcome and transplanted corneal endothelial cell density in eyes that have undergone cataract surgery after penetrating keratoplasty, and to compare surgical outcomes with those of a control group. Methods: We conducted a retrospective review of case records of 20 eyes that had undergone cataract surgery between January 2003 and April 2006 after previous penetrating keratoplasty (group I) and 20 eyes that had undergone cataract surgery alone with low cornea endothelial cell density (group II). Results: For both groups, the grade of nucleosclerosis affected postoperative best corrected visual acuity (BCVA) and the total phaco energy (phaco power×time) did not affect either BCVA or endothelial cell density. In group I, the factor that most affected change in corneal endothelial cell density after cataract surgery was the time interval between keratoplasty and phacoemulsification. Comparison of the surgical results showed an increase in BCVA for both groups, and the difference between the two groups was not statistically significant. However, group I showed a significantly greater decrease in corneal endothelial cell density than did group II. Conclusions: Our results suggest that the corneal endothelial cells of the eye having previously undergone penertrating keratoplasty are vulnerable to surgical insult occurring in procedures such as cataract surgery, and that the time interval between the two procedures can affect the change in endothelial cell density.