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서정훈,노인호,최미영,Jeong Hun Seo,In Ho Roh,Mi Young Choi 대한안과학회 2007 대한안과학회지 Vol.48 No.7
Purpose: To investigate the surgical outcome of patients with partially accommodative esotropia with a large angle of deviation. Methods: Twenty-one patients with partially accommodative esotropia that had angles of deviation of at least 40 prism diopters without correction, were retrospectively studied. They underwent standard surgery, for which the amount of recession was based on the average of the distance and near deviation with correction. The angle of deviation were evaluated at postoperative 3 months and at the last follow-up, and the Titmus test and Worth 4-dot test were performed after surgery. Results: The mean angle of deviation without correction at the first examination was 57.0PD, and the mean age of correction with glasses was 2.6 years. The mean angle of deviation with correction was 31.4PD. The mean age at surgery was 4.4 years. The mean follow-up period was 5.4 years. At 3 months postoperatively, 66.7%, 28.6%, and 4.8% of patients showed acceptable correction, undercorrection, and overcorrection, respectively. At the last visit, undercorrection decreased while overcorrection increased (66.7%, 23.8%, 9.5%). Titmus stereotest showed in positive results with more than 800 seconds of arc in 9 of 16 patients. A Worth 4-dot test resulted in a fusion response at far or at near in 4 of 17 patients. Conclusions: In partially accommodative esotropia with a large angle of deviation (at least 40PD without correction), the results of conventional surgery were relatively fair, while the prognosis of sensory function was poor.
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서정훈,이경숙,최미영,Jeong Hun Seo,Kyoungsook Lee,Mi Young Choi 대한안과학회 2010 대한안과학회지 Vol.51 No.9
Purpose: To examine the differences in surgical results between non-accommodative esotropia (NAE) and partially accommodative esotropia (PAE). Methods: This retrospective study included 47 patients undergoing surgery for pediatric esotropia, defined as esotropia with a decrease in the deviated angle of greater than ten prism diopters (PD) upon administration of hyperopic spectacles. On the other hand, NAE was defined as esotropia with a decrease in the deviated angle of less than 10PD. We compared age at surgery, deviated angle at surgery, frequency of amblyopia, and deviated angle at each postoperative period in two groups. Results: Twenty-nine patients belonged to the PAE group, and 18 patients belonged to the NAE group. The age at surgery in the PAE group was higher than that of the NAE group, and the deviated angle for surgical correction was smaller in the PAE group than in the NAE group. No statistically significant difference in the frequency of amblyopia presentation was found between the two groups. The surgical success rates were much higher in the PAE group at postoperative two years and at the final visit compared to those of the NAE group. Conclusions: In esotropic children who underwent surgery, the long-term surgical success rate was highest in the cases in which the esotropic angle was decreased by hyperopic correction. J Korean Ophthalmol Soc 2010;51(9):1258-1263
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공간감 인자로서의 고주파 대역 포락선 양이 시간차의 유효성
서정훈,전상배,성굉모,Seo, Jeong-Hun,Chon, Sang-Bae,Sung, Koeng-Mo 한국음향학회 2010 韓國音響學會誌 Vol.29 No.6
다채널 오디오 코딩 시스템을 평가함에 있어서 음색 요소뿐만 아니라 공간감 요소 역시 큰 중요성을 갖는다. 이러한 이유로 양이 시간차 왜곡 (Interaural Time Difference Distortion, ITDDist), 양이 크기차 왜곡 (Interaural Level Difference Distortion, ILDDist), 양이 상관관계 왜곡 (Interaural Cross Correlation Distortion, IACCDist)과 같은 공간감 요소를 추가하여 기존의 음질 객관 평가 권고안인 ITU-R Rec. BS. 1387-1을 다채널 오디오 시스템에 적용하기 위한 시도가 있었다. 이 다채널 오디오 시스템을 위한 확장 모델에서는 Duplex 이론에 따라, 양이 시간차 왜곡은 1.5kHz 이하의 저주파 영역에 대해서만 계산되었으며, 양이 크기차 왜곡은 2.5kHz 이상의 고주파 영역에 대해서만 계산되었다. 하지만 고주파 영역에 있어서 포락선의 양이 시간차는 공간감 인지에 있어서, 특히 음상 정위에 있어서 중요한 역할을 한다. 이러한 고주파 영역 포락선의 양이 시간차 공간감 인지에 미치는 영향을 정량적으로 분석하기 위해 해당 인자를 계산하는 방법이 본 논문에서 소개된다. 또한, 이렇게 계산된 고주파 영역 포락선의 양이 시간차는 다채널 오디오의 주관평가 결과와 높은 상관관계를 가짐을 확인한다. Both timbral features and spatial features are important in the assessment of multichannel audio coding systems. The prediction model, extending the ITU-R Rec. BS. 1387-1 to multichannel audio coding systems, with the use of spatial features such as ITDDist (Interaural Time Difference Distortion), ILDDist (Interaural Level Difference Distortion), and IACCDist (InterAural Cross-correlation Coefficient Distortion) was proposed by Choi et al. In that model, ITDDistswere only computed for low frequency bands (below 1500Hz), and ILDDists were computed only for high frequency bands (over 2500Hz) according to classical duplex theory. However, in the high frequency range, information in temporal envelope is also important in spatial perception, especially in sound localization. A new model to compute the ITD distortions of temporal envelopes in high frequency components is introduced in this paper to investigate the role of such ITD on spatial perception quantitatively. The computed ITD distortions of temporal envelopes in high frequency components were highly correlated with perceived sound quality of multichannel audio sounds.
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삽입된 인공수정체가 혼탁하여 시행한 인공수정체 교환술의 임상결과
서정훈,형성민,Jeong Hun Seo,Sungmin Hyung 대한안과학회 2008 대한안과학회지 Vol.49 No.8
Purpose: To evaluate the outcomes of posterior chamber lens (PCL) exchange in patients with opacified foldable PCLs. Methods: This study consisted of 31 patients (35 eyes) who had received phacoemulsification and implantation of foldable intraocular lenses in the bag or sulcus and developed late opacification of the PCL. All patients reported a reduction of visual acuity and deterioration in vision. The PCLs were explanted and replaced with new PMMA lenses. The perioperative complications and the best corrected visual acuities (BCVAs) before and after surgery were evaluated. Results: The mean visual acuities (logMAR value) before and after IOL exchange were 0.59±0.80 and 0.21±0.27, respectively. The difference was statistically significant (p=0.005, paired t-test). Intraoperative complications included posterior capsule rupture in six patients, zonular dehiscence in three patients, and both in one patient. Postoperative complications included intraocular pressure elevation in five patients and cystoid macular edema in two patients. One patient showed hypopyon at 6 days postoperatively, which lasted for 3 months, but she showed good visual acuity. Conclusions: Intraocular lens exchange was a safe and effective treatment for patients whose PCLs were opacified. J Korean Ophthalmol Soc 49(8):1226-1234, 2008
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서정훈,김상국,Jeong Hun Seo,Sang Kook Kim 대한안과학회 2007 대한안과학회지 Vol.48 No.5
Purpose: To report the first case of central retinal vein occlusion (CRVO) in association with thyroid ophthalmopathy. Methods: A 40-year-old woman was came to the ophthalmologic clinic due to conjunctival injection, lid swelling and decreased visual acuity in the left eye. She was ill with hyperthyroidism and was recovered completely. At the first visit, best corrected visual acuity of her left eye was 0.3. The left eye showed proptosis, episcleral vessel dilation, and moderate limitation of ocular movement. Orbit MRI revealed the enlargement of extraocular muscles. Fundus examination showed diffuse retinal hemorrhages with macular edema and retinal veins were dilated and tortuous. Fluorescein angiogram showed the diffuse leakage from the retinal vessels on the posterior pole, but nonperfusion area was not seen. Results: One month after the first visit, best corrected visual acuity of her left eye was improved to 0.6. Proptosis and limitation of ocular movement was improved, and retinal hemorrhages with macular edema were decreased remarkably. Conclusions: Possible retinal vascular complications such as CRVO may occur in patients with thyroid ophthalmopathy. Therefore, in these cases, fundus examination along with other ophthalmologic examinations are necessary.
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서정훈,이성준,이옥준,최미영,Jeong Hun Seo,MD,Seong Jun Lee,MD,Ok Jun Lee,MD,Mi Young Choi,MD 대한안과학회 2009 대한안과학회지 Vol.50 No.4
Purpose: To investigate the effects of sutureless faden operation to eliminate suture-related perioperative risks in a rabbit model. Methods: Twenty-eighty superior recti muscles of 14 rabbits were subjected to faden operation, at a distance of 6 mm from the insertion of the muscle. They were divided into four groups of 7 muscles each: group A, Beriplast-P ; group B, BardⓇ mesh (12×2 mm); group C, SurgiproⓇ mesh (6×2 mm); group D, SurgiproⓇ mesh (6×6 mm). Rabbits were sacrificed and the eyes were enucleated. The operative field was examined upon dissection, 4 weeks after the surgery. Histopathologic sections were examined for the degree (grade 0 to 4) of inflammation, fibrosis, atrophy and/or degeneration of muscle fiber. Results: Grossly, there was a mild adhesion at the myopexy site in group A, while there was greater adhesion at the myopexy site in groups B, C and D. Group B produced a pronounced adhesion, and the mesh firmly adhered to the sclera as well as to adjacent tissue. Upon histologic examination, group A showed a mild inflammatory reaction and fibrosis, whereas groups B and D showed a moderate inflammatory reaction and fibrosis. The degree of fibrosis in group D was more severe than that in group A (p<0.008), and there was no statistical significance among the other groups (p>0.05). There was atrophy and degeneration in the muscle fiber in all groups, with the exception of group D. Conclusions: In the rabbit model, 6×6 mm sized SurgiproⓇ mesh may be the best material in sutureless faden operation. J Korean Ophthalmol Soc 2009;50(4):603-611
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