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양지욱,이승진,강승범,박영훈,Ji-Wook Yang,Seung-Jin Lee,Seung-Bum Kang,Young-Hoon Park 대한안과학회 2008 대한안과학회지 Vol.49 No.5
Purpose: To report a case of retinal detachment surgery in a patient with oculocutaneous albinism. Case summary: A 44-year-old man visited our clinic complaining of decreased visual acuity in his left eye. His best corrected visual acuity was hand movement in his left eye, and rhegmatogenous retinal detachment involving the macula at the superior temporal site was found. We performed pars plana vitrectomy and attempted to reattach the retina using endolaser photocoagulation; however, the laser burn was not made, and we failed to reattach the retina. At that point, we carried out cryopexy around the retinal tear, and injected silicone oil into the vitreous cavity. Ten months after surgery, his best corrected visual acuity was 0.06, and there was no recurrent retinal detachment or proliferative vitreoretinopathy. Conclusions: In patients with albinism with melanin deficiency, cryopexy is more useful than laser photocoagulation for retinal detachment surgery. J Korean Ophthalmol Soc 49(5):840-844, 2008
양지욱,오태훈,박영훈.Ji-Wook Yang. MD. Tae-Hoon Oh. MD. Young-Hoon Park. MD 대한안과학회 2009 대한안과학회지 Vol.50 No.1
Purpose: We present three cases of atypical Harada's disease that exhibited different clinical courses. Case summary: (Case 1) A 56-year-old male initially presented with typical findings of Harada's disease accompanied by exudative retinal detachment of the left eye. However, he did not show any signs and symptoms of Harada's disease in his right eye for 4 years. (Case 2) A 73-year-old male came to our clinic complaining of decreased visual acuity in both eyes with headache and tinnitus. Fundoscopic findings showed bilateral annular choroidal detachment but no evidence of exudative retinal detachment. The same result was obtained on remission. (Case 3) A 53-year-old female presented with decreased visual acuity in both eyes with headache and tinnitus. Fundoscopic findings showed severe choroidal folds instead of exudative retinal detachment, which was observed in 2 other remissive cases. Conclusions: We report 3 cases of atypical Harada's disease that did not present with bilateral exudative retinal detachment. Ophthalmologists should know that Harada's disease can exhibit diverse clinical courses.
당뇨망막병증에서 패턴 범망막광응고술과 기존 범망막광응고술과의 치료 효과 비교
양지욱,이영춘,Ji-Wook Yang,Young-Chun Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.12
Purpose: To compare the therapeutic effects and complications after panretinal photocoagulation (PRP) and discomforts of patients using patterned PRP versus conventional PRP for diabetic retinopathy. Methods: Eighty patients who required PRP due to diabetic retinopathy were enrolled in a prospective randomized controlled study. The patients were randomly divided into two groups: a patterned PRP group in which PRP was performed with a short laser exposure time (0.02 seconds) and a conventional PRP group with a long exposure time (0.2 seconds). At the 1-year follow-up visit, the progressions of diabetic retinopathy, best-corrected visual acuity, and central macular thickness were evaluated. All patients were questioned about the grade of pain during PRP. In addition, the complications after PRP were investigated. Results: There were no statistical differences in clinical characteristics between both groups. The progression of diabetic retinopathy was not different in both groups at the 1-year follow-up visit. The best-corrected visual acuities at 1, 2, 4, and 8 weeks after PRP were decreased in both groups and, in the conventional PRP group, the decrements of visual acuity were greater than in the patterned PRP group. The increments of central macular thickness were also greater in the conventional PRP group than the patterned PRP group. Conclusions: When patterned PRP is performed using a short laser exposure time, the efficacy in the treatment of diabetic retinopathy is similar to that of the conventional PRP using a longer laser exposure time. Moreover, patterned PRP is less painful, and fewer complications. J Korean Ophthalmol Soc 2010;51(12):1590-1597
LiBr 수용액으로 용해시켜 제조한 거대억새 홀로셀룰로오스 용해 및 재생 필름특성
양지욱(Ji-Wook Yang),권구중(Gu-Joong Kwon),황교정(Kyo-Jung Hwang),황원중(Won-Jung Hwang),황재현(Jae-Hyun Hwang),김대영(Dae-Young Kim) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
In this study, dissolution characteristics of 60% LiBr aqueous solution for Miscanthus sinensis holocellulose in accordance with heating time and characteristics of regenerated films were analyzed. Miscanthus sinensis holocellulose was made by peracetic acid method. During the dissolution of 60% LiBr solution for the holocellulose, the dissolution was started from the tip of the cellulose fiber after about 7 minutes, and proceeded as it swollen like a balloon. A lot of Si was identified by analyzing hollocellulose regenerated film through SEM/EDS. Cross section of regenerated film as dissolution time till 40 minutes of dissolution showed multilayered structure and fiber orientation. But after 40 minutes, multilayered structure and fiber orientation was not observed. The crystal structure of the holecellulose was transformed cellulose I into cellulose II. Therefore, dissolution for 20 minutes with 60% LiBr solution in the condition of 190℃ hot plate was shown as an optimum condition to manufacture the holocellulose regenerated film.
양지욱(Ji-Wook Yang),정진(Jin Chung),박영훈(Young-Hoon Park) 대한검안학회 2011 Annals of optometry and contact lens Vol.10 No.1
목적: 안허혈 증후군 환자들의 임상 양상과 동반된 전신 질환을 분석하고 속목동맥(internal carotid artery) 협착 정도에 따른 시력 예후 및 임상 증상의 차이에 대해 알아보고자 하였다. 대상과 방법: 안허혈 증후군으로 진단된 11명(11안)의 의무 기록을 후향적으로 검토하여 세극등현미경검사 및 형광안저혈관조영술을 포함한 안과 검사와 자기공명혈관조영술, 목동맥초음파촬영술 또는 목동맥혈관조영술을 통해 시력, 홍채신생혈관 유무, 안압, 백내장 정도 및 속목동맥의 협착 정도를 조사하였고 뇌혈관 질환과 당뇨병, 고혈압, 심장 질환 등 전신 질환 유무도 확인하였다. 결과: 11명(11안)의 환자들의 평균 연령은 50.8세였다. 속목동맥 협착이 심할수록 최종 시력 예후가 더 나빴으며(p<0.01), 백내장이 관찰된 4안 중 3안(75%)에서 안허혈이 발생한 쪽에서 반대쪽과 비교하여 백내장의 발생과 진행이 더 심하였다. 4명(36.4%)의 환자에서 뇌혈관 질환의 병력이 있었고. 2명(18.2%)의 환자에서 심장 질환이 있었으며, 4명(36.4%)에서 당뇨, 5명(45.4%)에서 고혈압이 관찰되었다. 급성으로 발병한 1예에서 목동맥혈관조영술 시행 중에 속목동맥을 통한 우로키나아제(urokinase) 주입술로 0.04에서 1.0으로 시력이 호전되었다. 결론: 안허혈 증후군의 소견이 보일 때는 속목동맥에 대한 검사를 요하며 속목동맥의 협착이 심할수록 최종 시력 예후는 불량하였다. 안허혈이 발생한 눈에서 백내장 발생 및 진행이 더 심하였으며 속목동맥을 통한 항응고제 치료도 고려될 수 있다. Purpose: To evaluate the clinical manifestations and the systemic diseases of ocular ischemic syndrome and the relationship between the stenosis of internal carotid artery and the visual prognosis. Methods: We retrospectively reviewed the medical records of 11 ocular ischemic syndrome patients. By ocular examinations including slit lamp examination and fluorescein angiography, magnetic resonance angiography, carotid artery ultrasonography and trans-femoral carotid angiogram, we investigated visual acuity, new vessels at iris, intraocular pressures, grades of cataract and stenosis of internal carotid artery. Also we investigated the persences of cerebrovascular diseas, diabetes mellitus, hypertension, ischemic heart disease and other systemic disorders. Results: The average age of 11 patients was 50.8 years old. The final visual prognosis became poorer in proportion to the stenosis of internal carotid artery (p<0.01), there were more severe grades of cataract in the eyes which had ocular ischemic syndrome compared with unaffected eyes. 4 patients (36.4%) had cerebrovascular attack, 2 patients (18.2%) ischemic heart disease, 4 patients (36.4%) diabetes mellitus and 5 patients (45.4%) hypertention. In one case which had ocular ischemic syndrome acutely, visual acuity improved 0.04 initially to 1.0 after urokinase injection through internal carotid artery. Conclusions: When the clinical symptoms of ocular ischemic syndrome were shown, the examinations into internal carotid artery should be necessary. The final visual prognosis became poorer in proportion to the stenosis of internal carotid artery and there were more severe grades of cataract in the eyes which had ocular ischemic syndrome compared with unaffected eyes. And if ophthalmologist diagnosed ocular ischemic syndrome, anticoagulant therapy through internal carotid artery could be considered.