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황재형,신경훈,이성기,송지선,권지원,Jae Hyeong Hwang,Kyung Hoon Shin,Sung Ki Lee,Ji Sun Song,Ji Won Kwon 대한안과학회 2012 대한안과학회지 Vol.53 No.12
Purpose: To provide a case report of 1 patient (1 eye) who experienced recurrences of conjunctival papilloma and was treated with complete resection, electrocauterization, cryotherapy, intraoperative application of mitomycin C and postoperative topical mitomycin C. Case summary: We evaluated the clinical course of a 42-year-old male with recurrent conjunctival papillomas on the left upper and lower tarsal conjunctiva who was treated 10 times with a simple resection over the past 8 years. The patient was treated with complete resection, electrocauterization, intraoperative application of mitomycin C and cryotherapy. Topical mitomycin C was applied for 1 month. There was no recurrence or complications for 12 months postoperatively. Conclusions: Complete resection, electrocauterization, intraoperative application of mitomycin C, cryotherapy and topical mitomycin C in patients with recurrent conjunctival papilloma was shown to be an effective treatment without recurrence and complications.
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황재형,권지원,Jae Hyeong Hwang,MD,Ji Won Kwon,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.8
Purpose: To describe the characteristics of patients with pinguecula between the ages of 20 and 39. Methods: Thirty-two patients who visited our hospital between February 2013 and November 2013 for pinguecula were enrolled in the study. The clinical characteristics were evaluated by the location, size, shape, elevation, color, vascularization and the grade of pingueculae. Results: Ninety-eight pingueculae were found in the 32 patients, 58 (59.18%) pingueculae on the nasal side, and 40 (40.82%) pingueculae on the temporal side. The mean grade of pingueculae of the nasal side was 1.19 ± 0.40 and on the temporal side was 1.15 ± 0.43. Compared with the temporal side, pingueculae on the nasal side were more frequent (<em>p </em>= 0.032). The size, color, shape and vascularization of nasal and temporal pingueculae were not significantly differentiated. Medical history, tear film break-up time, Schirmer test, history of contact lens wearing, refractive surgery, occupational activity and residence were not correlated with the grade of pingueculae. However, ocular surface disease index score was correlated with the grade of nasal pingueculae (<em>p</em> = 0.01). Conclusions: The pingueculae of the nasal side were more frequent than of the temporal side in patients between 20 and 39 years of age, and dry eye disease with tear film instability was also present. The ocular surface disease index score increased with the grade of nasal pingueculae. J Korean Ophthalmol Soc 2014;55(8):1126-1131
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중심망막동맥폐쇄로 진단된 환자들의 장기 임상결과와 예후 인자
황재형,임수현,김철구,김종우,김재휘 한국망막학회 2021 Journal of Retina Vol.6 No.1
Purpose: To evaluate long-term clinical outcomes of patients with central retinal artery occlusion and to investigate factors associated with visual recovery. Methods: This retrospective study was performed on 31 patients with central retinal artery occlusion. The patients were divided into 3 groups according to degree of vascular occlusion: incomplete, subtotal, total. Visual acuity was classified as finger counting or worse, 0.02 or better and worse than 0.1, and 0.1 or better. The proportions of patients in these 3 groups at diagnosis were compared to those at the final follow-up. In addition, factors associated with visual recovery were investigated. Results: The mean follow-up period was 40.0 ± 22.0 months. According to degree of vascular occlusion, 10 patients were incomplete, 17 were subtotal, and 4 were total. During the follow-up period, visual acuity was recovered in 14 patients, maintained in 6, and deteriorated in 11. At diagnosis, visual acuity was finger counting or worse in 77.4% of patients, 0.02 or better and worse than 0.1 in 22.6%, and 0.1 or better in 0. At the final visit, these proportions changed to 58.1%, 22.6%, and 19.4% (p = 0.013), respectively. Visual recovery was limited with greater degree of occlusion (p = 0.004). Conclusions: During the follow-up period, visual recovery was noted in 45% of patients with central retinal artery occlusion. Degree of vascular occlusion was identified as a factor predictive of visual recovery. 목적: 중심망막동맥폐쇄 환자의 장기 임상 결과를 확인하고 시력회복과 연관된 인자들을 분석하고자 하였다. 대상과 방법: 중심망막동맥폐쇄로 진단받은 31안을 대상으로 후향적 연구를 시행하였다. 전체 환자를 혈관폐쇄 정도에 따라 불완전폐쇄, 부분폐쇄, 전체폐쇄의 세 군으로 구분하였다. 시력을 안전수지 이하, 0.02 이상/0.1 미만, 0.1 이상의 세 군으로 구분하여 진단 및최종추적 관찰 시 각 군의 비율 차이를 확인하였다. 추가적으로 시력회복과 관련된 인자들을 분석하였다. 결과: 평균 추적 관찰 기간은 40.0 ± 22.0개월이었으며, 불완전폐쇄 10명, 부분폐쇄 17명, 전체폐쇄 4명이었다. 추적 관찰 중 14명에서 시력이 회복되었다. 진단 당시의 시력은 안전수지 이하가 77.4%, 0.02 이상/0.1 미만이 22.6%, 0.1 이상은 없었으며, 최종추적 관찰 시에는 각각 58.1%, 22.6%, 19.4%였다(p = 0.013). 혈관폐쇄 정도가 심할수록 시력회복이 제한되는 결과를 보였다(p = 0.004). 결론: 중심망막동맥폐쇄를 추적 관찰한 결과 약 45%에서 시력회복이 나타났다. 혈관폐쇄의 정도는 장기 시력회복을 예측할 수 있는인자였다.
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황재형,정원영,Hwang, Jae Hyung,Jeong, Won Young 한국의류학회 2017 한국의류학회지 Vol.41 No.4
The helmet is an imperative personal protective equipment. This protective device must be able to guard the human head against potential risks. Helmets are classified according into the purpose of use; therefore, the required performance and specifications depend on the type of products. Military helmets are intended to protect the wearer's head from bullets and shrapnel. Generally, lightweight super fibers and fiber reinforced composite materials are used as helmet shell materials, and NIJ STD of U.S. Department of Justice is most widely used as international standard related to bulletproof helmets. Safety helmets are widely used for industrial application and sports leisure. In general, the performance of shock absorption must be ensured, and various lining systems are applied in material, design, and combination methods. Evaluation standards have also been classified and strictly controlled for each purpose; therefore, it is difficult to certify with the existing standards such as the recently developed convergence helmets. However, it is possible to launch the product through a separate national integrated certification procedure.
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황재형,나승관,유영주,김철구,김종우,김재휘 대한안과학회 2022 대한안과학회지 Vol.63 No.4
목적: 망막색소변성으로 진단된 국내 환자의 임상적 특성을 알아보고자 한다. 대상과 방법: 2014년 1월부터 2019년 12월 사이에 망막색소변성으로 최초 진단받은 환자를 대상으로 후향적 의무기록 분석을 시행하였다. 환자의 나이, 성별, 주된 소견 및 최대교정시력을 확인하였다. 추가로 후낭하백내장 여부, 빛간섭단층촬영상의 이상 소견, 시야검사, 눈전위도검사의 결과에 대한 분석을 시행하였다. 결과: 총 246명 492안을 대상으로 결과를 분석하였다. 평균 나이는 48.0 ± 16.0세였으며, 주된 주호소는 시력저하와 야맹증이었다. 평균 logMAR 최대교정시력은 0.31 ± 0.50이었으며 368안(74.8%)에서 decimal 시력이 0.5 이상이었다. 시야검사를 시행한 462안중 328안(71.0%)에서 중심 10° 이내의 시야이상이 나타났으며, 눈전위도검사를 시행한 242안에서 평균 아덴비는 1.28 ± 0.28이었다. 빛간섭단층촬영에서 유리체황반견인/망막앞막이 135안(27.4%), 낭포황반부종이 48안(9.8%), 황반의 얇아짐이 112안(22.8%)에서관찰되었다. 중심와 타원체구역 상태의 경우 온전한 상태가 222안(45.1%), 손상된 상태가 220안(44.7%), 심한 손상으로 관찰되지 않는상태가 50안(10.2%)이었다. 결론: 망막색소변성 환자들은 진단 시 0.5 이상의 시력을 보이는 경우가 많았으나 높은 빈도로 중심시야의 손상이 나타났다. 대부분의환자에서 빛간섭단층촬영상 다양한 이상 소견이 관찰되었다.
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