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허환,박상우,박영걸 대한안과학회 2005 대한안과학회지 Vol.46 No.10
Purpose: In order to propose reference values useful for in diagnosing the strabismus related to the abnormal intraorbital pathway of rectus muscles, we evaluated the intraorbital positions and angles of each rectus muscle in normal subjects. Methods: Using previously scanned orbital MRI and orbital CT of patients who did not show any strabismus or organic disease in the orbit, we calculated the angles of each rectus muscle in the orbit, and compared the results with those of a patient with large angle exotropia. Results: Using orbital MRI and orbital CT, the normal angles of each rectus muscles 10 mm posterior to the globe center were -5.1±3.4 and -1.5±6.0 degrees in the medial rectus, 185.8±8.1 and 180.8±6.9 degrees in the lateral rectus, 98.1±6.03 and 87.9±6.7 degrees in the superior rectus, and -79.7±6.1 and -83.1±11.7 degrees in the inferior rectus, respectively. In the patient with large angle exotropia, each rectus muscle showed orbital pathways similar to the normal patients. Conclusions: We evaluated the normal positions and angles of each rectus muscle in the orbit. The results may be useful in diagnosing the strabismus related to an abnormal orbital pathway of rectus muscles.
선천 상사근마비의 수직편위각에 따른 하사근 수술의 효과
허환,박상우,박영걸.Hwan Heo. M.D.. Sang Woo Park. M.D.. Yeoung Geol Park. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.4
Purpose: To compare the postoperative results of inferior oblique muscle operation in congenital superior oblique palsy (CSOP) according to the preoperative vertical deviation. Methods: This study reviewed medical records of 26 patients who were diagnosed as CSOP with the largest vertical deviation at adducted position and incomitant vertical strabismus from May 2003 to April 2004 at hospital. The patients were divided into two groups, the group 1 (18 patients) shows less than 20 prism diopter (PD) vertical deviation at the primary position, the group 2 (10 patients) shows no less than 20 PD vertical deviation at the primary position preoperatively. We performed operation of the inferior oblique muscle (IOM) for both group. We evaluated the surgical effect at the primary position and both lateral gaze after 3 months. and performed reoperation as needed. Results: Mean correction amount of vertical deviation at primary position of two groups were 11.6±2.7 PD in the group 1 and 7.4±3.5 PD in the group 2. Postoperative vertical deviation was decreased compared to preoperative value and it was statistically significant. But there were statistically significant differences in the corrected amount after inferior oblique muscle operation between two groups at all gazes. Surgical result of group 1 was successful (100%), but in group 2, all failed (100%) and needed reoperation. Conclusions: This study showed that corrected amount with IOM operation was smaller in CSOP with no less than 20 PD vertical deviation at primary position and incomitant vertical strabismus. It may be taken into consideration when operation for rectus and oblique musle were performed simultaneously in CSOP.
일체형과 삼체형 아크릴 인공수정체의 장기 추적관찰 결과의 비교
허환,김황균,윤경철,박영걸,Hwan Heo,Hwang Gyun Kim,Kyung Chul Yoon,Yeoung-Geol Park 대한안과학회 2008 대한안과학회지 Vol.49 No.2
`Purpose: To compare the long-term clinical results of one-piece Acrysof? (SA60AT) hydrophobic acrylic intraocular lens (IOL) implantation compared with implantation of three-piece Acrysof? (MA60BM) hydrophobic acrylic IOL. Methods: We retrospectively analyzed each 50 eyes of 50 patients underwent MA60BM or SA60AT IOL implantation and followed for at least 6 months. Results: Final visual acuity of 0.5 or better was 38 eyes (76%) and 0.8 or better was 20 eyes (40%) in the SA60AT group. In the MA60BM group, it was 41 eyes (82%) and 23 eyes (46%) respectively. There were no significantly differences in predictability, intraocular pressure, endothelial cell density, astigmatism, and incidence of posterior capsule opacification between the two groups. Spherical equivalent at postoperative 1 week was -0.50±0.95D in SA60AT group and was -0.31±0.88D in MA60BM group (P=0.04). However, there was no significant difference between the two groups during follow up period. In MA60BM group, anterior chamber depth (P=0.02) and distance between iris and IOL (P=0.04) reduced significantly during the first postoperative month. Conclusions: Early postoperative axial displacement and changes in spherical equivalent can be occurred in MA60BM group. However there was no difference in long-term clinical results between SA60AT and MA60BM groups. `
허환,강인성,오미화,윤경철.Hwan Heo. M.D.. In Sung Kang. M.D.. Mei Hwa Wu. M.D.. Kyung Chul Yoon. M.D. 대한안과학회 2006 대한안과학회지 Vol.47 No.8
Purpose: To evaluate the therapeutic effect of topical testosterone gel application to periocular area in dry eye. Methods: Thirty-four eyes of 17 patients with refractory dry eye were included. Five patients had Sjogren`s syndrome and 12 were non-Sjogren`s syndrome patients. Testosterone gel was applied on the periocular area three times a day. Symptom score corneal sensitivity test (CST), tear film break-up time (BUT), basal tear secretion test (BST), fluorescein staining, tear clearance test (TCR), and conjunctival impression cytology were checked and evaluated before, one month after and two months after treatment. Results: The mean symptom score before topical testosterone gel application was 3.44±0.70; it was 2.88±0.84 at 1 month after application and 2.03±1.09 at 2 months after application. The improvement of tear film parameters including BUT, tear clearance rate, fluorescein staining score, conjunctival metaplasia and goblet cell density was statistically significant (P<0.05) at one and two months after treatment but neither BST nor CST was improved with statistically significance. There was no difference in the therapeutic effect of topical testosterone gel between Sjogren`s syndrome and non-Sjogren`s dry eye patients. Conclusions: The function of tear film and the integrity of ocular surface improved after topical application of testosterone gel in dry eye patients. Topical testosterone gel application may be an effective adjuvant therapy for the treatment of dry eye.
허환,안효성,홍성제,이남수 제어로봇시스템학회 2009 제어로봇시스템학회 국내학술대회 논문집 Vol.2009 No.9
To greatly expand the use of mobile robot applications, a mobile robot should have the ability to cope with arbitrary environment without previous information. For carrying out some work, the mobile robot should be equipped with functions such as obstacle avoidance and goal approach, local mapping, and pedestrian localization. In this paper, the designed system improves these three function: for obstacle avoidance and goal approach, fuzzy logic is applied on an embedded system, which improves performance according to real time processing; for local mapping, position sensitive device (PSD) and ultrasonic sensor are used and a filtering algorithm of two degrees is proposed; for the pedestrian localization, chirp spread spectrum (CSS)-based indoor localization system is developed and its performance suitable for tracking a pedestrian is revealed through practical experiments.