Song Ee Chung

Sungkyunkwan University, Sŏul, Seoul, South Korea

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Publications (21)39.99 Total impact

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    ABSTRACT: PURPOSE:: The purpose of this study was to identify a correlation between engorgement of the vortex vein and the development of polypoidal choroidal vasculopathy (PCV). METHODS:: Engorgement of the vortex vein was evaluated by masked observers using a montage of indocyanine green angiography images. Sixty-three eyes with PCV, 27 uninvolved fellow eyes with PCV, and 30 eyes of age-matched control subjects were included. The incidence and distribution pattern of engorgement were evaluated. RESULTS:: Thirty-three eyes (52.4%) of PCV evidenced engorgement of the vortex vein, whereas such engorgement was detected in only 7 of the 30 eyes (30.4%) of the control subjects (P = 0.016). Among 27 fellow eyes with PCV, it was detected in 11 (40.7%) (P = 0.706 vs. control eyes). In all groups, it was most frequently detected at the inferior temporal quadrant. In eyes with PCV, mean (±standard deviation) choroidal thickness of the eyes evidencing vortex vein engorgement was 338.1 ± 131.3 μm and the thickness of those not evidencing vortex vein engorgement was 275.1 ± 107.7 μm. When the choroidal thickness increased to 10 μm in the eyes with PCV, the odds of detecting the engorgement was multiplied by a factor of 1.05 (P = 0.042). The incidence of the engorgement of vortex vein was correlated with the presence of choroidal vascular hyperpermeability (P = 0.009). CONCLUSION:: This study demonstrates that engorgement of the vortex vein was observed more frequently in the eyes with PCV. Such a finding was associated with choroidal thickening and choroidal vascular hyperpermeability. These indicate that the engorgement of the vortex vein might be involved in the pathogenic mechanisms of PCV.
    Retina (Philadelphia, Pa.) 10/2012; · 2.93 Impact Factor
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    ABSTRACT: To report the three-year outcomes of macular laser photocoagulation following intravitreal injection of triamcinolone acetonide (IVTA) for diffuse diabetic macular edema (DME). A prospective, randomized controlled study was completed. Eighty-six eyes of 74 patients with diffuse DME were randomized into two groups. Eyes assigned to the combination group (n = 48) were subjected to macular laser photocoagulation three weeks after IVTA. Eyes in the IVTA group (n = 38) underwent IVTA alone. Central macular thickness was measured by optical coherence tomography, and the number of additional treatments and mean time to recurrence were assessed. Thirty-seven eyes in the combination group and 26 eyes in the IVTA group completed the three-year follow-up. Recurrence of DME after initial treatment was not observed for nine of the 37 (24.3%) eyes in the combination group or for one of the 26 (3.9$) eyes in the IVTA group (p = 0.028). DME was absent for 19.9 months after treatment in the combination group compared to 10.3 months in the IVTA group (p = 0.027). The mean number of additional treatments was 0.92 in the combination group and 1.88 in the IVTA group (p = 0.001). Results in the subset of subjects who completed the three-year follow-up demonstrated that laser photocoagulation following IVTA is more effective than IVTA monotherapy for diffuse DME. Combination therapy required fewer additional treatments and resulted in a lower recurrence rate than IVTA monotherapy.
    Korean Journal of Ophthalmology 10/2012; 26(5):362-8.
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    ABSTRACT: To assess longitudinal changes and determine their angiographic risk factors in the fellow eyes of patients with unilateral polypoidal choroidal vasculopathy (PCV). We reviewed the medical records of 47 patients with unilateral PCV, all of whom had completed at least 12 months of follow-up. The angiographic features were evaluated including the development of active PCV over time, choroidal vessel dilation, choroidal vascular hyperpermeability, the branching vascular network (BVN) and late geographic hyperfluorescence (LGH), which was defined as a well-demarcated geographic hyperfluorescent lesion on late-phase on indocyanine green angiography (ICGA). The mean follow-up period was 30.3±12.2 months. Among 47 fellow eyes, 24 (51.1%) had choroidal vascular dilation, 27 (57.4%) had choroidal vascular hyperpermeability, six (12.8%) had BVN and 23 (48.9%) had LGH. The development of active PCV was noted in nine fellow eyes (19.1%), all of which had exhibited LGH at baseline. However, PCV did not develop in eyes without features of LGH at baseline (p<0.001). The development of PCV was noted in three eyes with notification of BVN at baseline; however, PCV also developed in six eyes without apparent features of BVN (p=0.08). The presence of LGH on ICGA in the fellow eye appears to be a significant risk factor for the development of active PCV and may constitute the diagnosis of preclinical PCV.
    The British journal of ophthalmology 07/2012; 96(9):1217-21. · 2.92 Impact Factor
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    Song Ee Chung, Se Woong Kang, Chan-Hui Yi
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    ABSTRACT: This retrospective observational case series on eyes from three patients was done to elucidate the developmental mechanism of spontaneous reattachment of rhegmatogenous retinal detachment (SRRRD). The study eyes of each patients showed evidence of retinal break and diffuse retinal pigmentary change. Ultrasound biomicroscopic examination revealed vitreous fibers attached to the area around the retinal break. Posterior vitreous attachment was confirmed in each eye. A thin fibrovascular membrane incompletely sealing the retinal break was noted in one case. We suggest that the vitreous attachment around the retinal break and the sealing of the break with adjacent vitreous fibers seem to be involved in the developmental mechanism of SRRRD.
    Korean Journal of Ophthalmology 04/2012; 26(2):135-8.
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    ABSTRACT: To evaluate the long-term effects of combined therapy of vitrectomy, intravitreal triamcinolone, and macular laser photocoagulation on diabetic macular edema (DME) unresponsive to prior treatment. Medical records of 46 eyes of 41 subjects who underwent sequential combined therapy consisting of vitrectomy, intravitreal triamcinolone, and macular laser photocoagulation for refractory DME of non-tractional origin were reviewed. Best-corrected visual acuity (BCVA), central subfield thickness (CST) of macula, and number of additional treatments were analyzed. Forty eyes of 35 patients completed a 3-year follow-up. The mean (± SD) CSTs before and 6 months, 1 year, 2 years, and 3 years after the administration of combined therapy in these eyes were 499.1 ± 174.9, 224.2 ± 110.2, 273.4 ± 173.5, 237.5 ± 84.2 and 219.4 ± 66.6 µm, respectively (p < 0.001). The mean (± SD) logMAR BCVA before and 6 months, 1 year, 2 years, and 3 years after the combined therapy were 0.82 ± 0.32, 0.69 ± 0.40, 0.63 ± 0.39, 0.61 ± 0.46, and 0.55 ± 0.44, respectively (p < 0.001). Thirty-one of 40 eyes (77.5%) exhibited no recurrence of DME after the combined therapy. No visually significant complications other than progression of lens opacity and elevation of intraocular pressure were noted during the study period. This study demonstrated the long-term stability and efficacy of the combined therapy described herein for the treatment of refractory DME.
    Albrecht von Graæes Archiv für Ophthalmologie 12/2011; 250(5):679-84. · 1.93 Impact Factor
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    ABSTRACT: To compare clinical outcomes for patients with central serous chorioretinopathy (CSC) undergoing either focal laser photocoagulation or photodynamic therapy (PDT). 26 eyes of 26 patients with symptomatic CSC underwent focal laser photocoagulation or half-dose PDT, as appropriate. Best-corrected visual acuity, optical coherence tomography and multifocal electroretinography were assessed prospectively prior to treatment and at 1, 3 and 6 months after treatment. 12 eyes in the focal laser group and 14 eyes in the PDT group were evaluated. One month after PDT, all eyes, except one, showed complete absorption of subretinal fluid, whereas five eyes in the focal laser group showed residual subretinal fluid (p=0.022). Visual acuity and parameters of multifocal electroretinography improved from baseline at 1, 3 and 6 months after treatment, without any significant differences between the two groups. However, compared with those in the PDT group at 1 month after treatment, P1 latencies in the first annuli of the focal laser group were delayed (40.1 ± 5.5 ms and 34.9 ± 2.5 ms, respectively; p=0.047). Compared with focal laser, half-dose PDT may facilitate earlier resolution of macular detachment and earlier recovery of central retinal function. However, at 3 months after treatment and thereafter, no difference in anatomical and functional recovery was noted between the two modalities of treatment.
    The British journal of ophthalmology 04/2011; 95(4):514-7. · 2.92 Impact Factor
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    ABSTRACT: In a study conducted 15 years ago, the "Vitrectomy for Prevention of Macular Hole Study Group" was not able to prove the benefits and advantages of vitrectomy for treatment of impending macular holes; however, during the interim period, notable improvements have been achieved concerning diagnosis and efficacy of treatment. This study aims to identify the effect of current vitreous surgery for treatment of symptomatic impending macular holes. Nineteen eyes of 17 consecutive patients who had undergone vitrectomy with internal limiting membrane peeling and short-acting gas tamponade for treatment of symptomatic impending macular holes were reviewed. Outer foveal defects on preoperative optical coherence tomography were demonstrated in all cases. We analyzed visual outcome and postoperative change in foveal appearance on optical coherence tomography. The follow-up period ranged from 3 months to 41 months, with a mean of 13.5 months. Mean logarithm of the minimum angle of resolution best-corrected visual acuity improved postoperatively from 0.42 ± 0.18 to 0.11 ± 0.11 (P < 0.01). Postoperative optical coherence tomography examination revealed anatomical closure with complete disappearance of outer foveal defects in all patients. In symptomatic patients with impending macular holes, current vitreous surgery may prevent progression to a full-thickness macular hole and improve visual outcome. A randomized trial is warranted.
    Retina (Philadelphia, Pa.) 01/2011; 31(5):909-14. · 2.93 Impact Factor
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    ABSTRACT: To compare choroidal thickness between eyes with polypoidal choroidal vasculopathy (PCV) and eyes with age-related macular degeneration (AMD). Observational, comparative case series. Twenty-five eyes with PCV, 14 uninvolved fellow eyes with PCV, 30 eyes with exudative AMD, 17 eyes with early AMD, and 20 eyes of age-matched normal subjects. Choroidal thickness was measured using enhanced-depth imaging optical coherence tomography. Subfoveal choroidal thickness in each eye was analyzed by measurement of the vertical distance from the Bruch's membrane to the innermost scleral layer. Nasal, superior, temporal, and inferior choroidal thicknesses, 1500 μm apart from the foveal center, were also evaluated in all eyes. Choroidal thickness in each group. Mean (± standard deviation) subfoveal choroidal thickness in eyes with PCV and in their uninvolved fellow eyes was 438.3±87.8 μm and 372.9±112.0 μm, respectively, which was significantly greater than in eyes of age-matched normal subjects (224.8±52.9 μm) (P<0.001 and P = 0.003, respectively). Subfoveal choroidal thickness of eyes with exudative AMD (171.2±38.5 μm) and eyes with early AMD (177.4±49.7 μm) was thinner than that of age-matched normal subjects (P = 0.004 and P = 0.078, respectively). Choroidal thickness at each of the other 4 points showed a similar tendency. This study demonstrates thickening of choroid in the eyes with PCV, in contrast with choroidal thinning observed in eyes with AMD. These findings suggest involvement of different pathogenic mechanisms in PCV from those in exudative AMD.
    Ophthalmology 01/2011; 118(5):840-5. · 5.56 Impact Factor
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    ABSTRACT: To describe the clinical and optical coherence tomography (OCT) features of a macular hole (MH) or its precursor lesion in patients treated with systemic antiestrogen agents. We reviewed the medical history of the patient, ophthalmic examination, and both fundus and OCT findings. Three female patients receiving antiestrogen therapy sought treatment for visual disturbance. All of the patients showed foveal cystic changes with outer retinal defect upon OCT. Visual improvement was achieved through surgery for the treatment of MH in two patients. Antiestrogen therapy may result in MH or its precursor lesion, in addition to perifoveal refractile deposits. OCT examination would be helpful for early detection in such cases.
    Korean Journal of Ophthalmology 10/2010; 24(5):306-9.
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    ABSTRACT: To describe the clinical implications of outer foveolar defects on optical coherence tomography (OCT) in eyes treated surgically for macular hole (MH). Retrospective observational case series. Ninety-six eyes of 93 subjects who had undergone surgery for the treatment of idiopathic MH were included. Clinical data, including OCT prior to and at follow-up visits ranging from 3 to 32 months after surgery, were analyzed. Incidence, risk factors, and clinical outcomes of outer foveolar defect were evaluated. Outer foveolar defects were noted on postoperative OCT in 44 of the 96 eyes (45.8%). The mean preoperative diameter of MH in the eyes (333.5 ± 126.3 μm) evidencing outer foveolar defects was significantly smaller than those that did not (504.2 ± 155.6 μm) (P < .0001). The mean disappearance time of the defect was estimated to be 182 days after surgery. The mean postoperative visual acuity (logMAR) improved to 0.40 ± 0.26 from 0.58 ± 0.23 after the disappearance of outer foveolar defects. Outer foveolar defects were detected predominantly after surgery for small MHs. The defect decreases gradually in size and eventually disappears completely approximately 6 months after surgery.
    American Journal of Ophthalmology 10/2010; 150(4):551-7. · 4.02 Impact Factor
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    ABSTRACT: To identify the correlation between preoperative optical coherence tomography (OCT) features and postoperative visual outcomes in eyes with idiopathic macular holes (MHs). Data from 55 eyes with idiopathic MHs which had been sealed by vitrectomy were retrospectively reviewed. Correlation analysis was conducted between postoperative visual acuity (V(postop), logarithm of the minimum angle of resolution [logMAR]) and preoperative factors, including four OCT parameters: the anticipated length (A) devoid of photoreceptors after hole closure, MH height (B), MH size (C), and the grading (D) of the viability of detached photoreceptors. Additionally, the formula for the prediction of visual outcome was deduced. V(postop) was determined to be significantly correlated with the preoperative visual acuity (V(preop)) and OCT parameters A, C, and D (p<0.001). Based on the correlation, the formula for the prediction of V(postop) was derived from the most accurate regression analysis: V(postop)=0.248xV(preop)+1.1x10(-6)xA(2)-0.121xD+0.19. The length and viability of detached photoreceptors are significant preoperative OCT features for predicting visual prognosis. This suggests that, regardless of the MH size and symptom duration, active surgical intervention should be encouraged, particularly if the MH exhibits good viability in the detached photoreceptor layer.
    Korean Journal of Ophthalmology 08/2010; 24(4):213-8.
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    ABSTRACT: Peripheral exudative hemorrhagic chorioretinopathy (PEHCR) is a rare condition characterized by either subretinal exudates or subretinal hemorrhage outside the macula. The objective of this case report is to describe PEHCR lesions in Korean patients. Five eyes of four patients are reviewed. All cases were characterized by either peripheral subretinal exudates or hemorrhage with age-related degeneration. Four of the lesions appeared as subretinal masses, and the other manifested as a large retinal pigment epithelial alteration combined with subretinal exudates and subretinal fibrosis. Two of the patients evidenced serious visual impairment induced by massive subretinal hemorrhage extending to the fovea. Visual acuity in the other three eyes studied remained stable. PEHCR appears to be a variant of age-related macular degeneration that occurs in Asians. Although PEHCR is known to be self-limiting, it frequently causes subfoveal extensions of subretinal blood and fluid.
    Japanese Journal of Ophthalmology 05/2010; 54(3):227-31. · 1.27 Impact Factor
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    ABSTRACT: To assess the diagnostic efficacy of macular and peripapillary retinal thickness measurements for the staging of diabetic retinopathy (DR) and the prediction of disease progression. In this prospective study, 149 diabetic patients (149 eyes) and 50 non-diabetic control subjects were included. Baseline optical coherence tomography was employed to measure retinal thickness in the macula (horizontal, vertical, and central) and the peripapillary zone (superior, inferior, nasal, and concentric to the optic disc). Seven baseline parameters were correlated with the DR stages identified by fluorescein angiography. Baseline retinal thickness was compared between groups of patients requiring panretinal photocoagulation (PRP) within 6 months (PRP group) and patients not requiring PRP (No-PRP group). Macular and peripapillary retinal thicknesses in diabetic subjects were significantly greater than that in normal controls (p<0.05). All retinal thickness parameters, and particularly peripapillary circular scans, tended to increase with increasing DR severity (p<0.05). The baseline thicknesses of the peripapillary circular scans were greater in the PRP group than in the no-PRP group (p<0.05). Peripapillary retinal thickness may prove to be a useful criterion for DR severity and may also serve as an indicator of disease progression.
    Korean Journal of Ophthalmology 02/2010; 24(1):16-22.
  • Song Ee Chung, Kuk-Hyoe Kim, Se Woong Kang
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    ABSTRACT: To evaluate the correlation between the incidence of vitrectomy-related retinal breaks and the induction of a posterior vitreous detachment (PVD). Retrospective, nonrandomized comparative study. Three hundred and eleven eyes of 311 patients who underwent pars plana vitrectomy for the treatment of epiretinal membrane (ERM) or macular hole (MH) were reviewed. We identified the incidence of retinal breaks, the number of eyes requiring induction of PVD during operation, and the possible associated factors for retinal break in the 2 groups. The incidence of retinal breaks related to the operation was 6.9% (12/174 eyes) in the ERM group and 14.6% (20/137 eyes) in the MH group (P = .02). Induction of PVD was carried out in 28 eyes (16.0%) of the ERM group and in 105 eyes (76.6%) of the MH group (P = .01). Intraoperative or postoperative retinal breaks, or both, in the ERM group were detected in 9 (32.1%) of 28 eyes with induction of PVD and in 3 (2.1%) of 146 eyes without induction of PVD (P = .006). A similar trend also was observed in the MH group; retinal breaks related to the operation were detected in 19 (12.7%) of 105 eyes with induction of PVD and in 1 (3.1%) of the 32 eyes without induction of PVD (P = .008). Induction of PVD during vitrectomy results in a significantly higher incidence of intraoperative or postoperative retinal breaks, or both. Caution should be exercised after the induction of PVD to identify all retinal breaks so they can be treated.
    American Journal of Ophthalmology 04/2009; 147(6):1012-6. · 4.02 Impact Factor
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    Journal of the Korean Ophthalmological Society 01/2009; 50(6).
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    ABSTRACT: To evaluate the short-term efficacy and safety of intravitreal bevacizumab injection (IVBI) in patients with retinal angiomatous proliferation (RAP). Seven eyes of 5 patients with RAP were included in this study. All of the eyes evidenced stage 2 RAP lesions, except for one eye with a stage 3 lesion. IVBI (1.25 mg/0.05 cc) were conducted at 4 or 6-week intervals. Complete ocular examinations, angiographic results and optical coherence tomographic findings before and after the IVBI were analyzed at baseline and upon the follow-up visits. Seven eyes were studied in 5 patients who had undergone IVBI. Partial (3 eyes) or complete (4 eyes) regression of RAP was noted after IVBI in all of the studied eyes. Visual acuity improved in 5 of the eyes, and was stable in 2 of the eyes. One eye evidenced severe intraocular inflammation after IVBI and a subsequent development of new RAP, which was controlled with vitrectomy and repeat IVBI. This treatment was effective over 6 months, stabilizing or improving visual acuity and reducing angiographic leakage. These short-term results suggest that IVBI may constitute a promising therapeutic option, particularly in the early stages of RAP.
    Korean Journal of Ophthalmology 01/2008; 21(4):213-5.
  • Jong Hun Bak, Song Ee Chung, Se Woong Kang
    Journal of the Korean Ophthalmological Society 01/2008; 49(12).
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    ABSTRACT: To assess the efficacy of the ultrasound biomicroscopic (UBM) method in estimating the sulcus-to-sulcus horizontal diameter for Visian Implantable Contact Lens (ICL, model V4) length determination to obtain optimal ICL vault. The results of postoperative ICL vaults in 30 eyes of 18 patients were retrospectively analyzed. In 17 eyes, ICL length was determined using the conventional method, and in 13 eyes, ICL length was determined using the UBM method. The UBM method was carried out by measuring the sulcus to limbus distance on each side by 50 MHz UBM and adding the white-to-white diameter by caliper or Orbscan. The ICL vaults were measured using the UBM method at 1 and 6 months postoperatively and the results were compared between the two groups. Ideal ICL vault was defined as vault between 250 and 750 microm. The relation between the ICL vault, footplate location, and ICL power was also investigated. In the UBM method group, ICL vault was within the ideal range in all 13 (100%) eyes at 1 and 6 months postoperatively, whereas in the conventional method group, 10 (58.8%) eyes showed ideal vault at 1 month postoperatively (P = .01) and 9 (52.9%) eyes showed ideal vault at 6 months postoperatively (P < .01). The ideal ICL footplate location was achieved in the ciliary sulcus in 11 (84.6%) eyes of the UBM method group and 10 (64.7%) eyes of the conventional method group. However, the differences between the two groups were not statistically significant. The ICL vault was not significantly affected by the ICL power. Implantable Contact Lens length determined by the UBM method achieved significantly more ideal ICL vault than that of the conventional white-to-white method. The UBM method is superior to the conventional method in terms of predicting the sulcus-to-sulcus horizontal diameter for ICL length determination.
    Journal of refractive surgery (Thorofare, N.J.: 1995) 04/2007; 23(4):362-7. · 2.47 Impact Factor
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    ABSTRACT: To describe the clinical characteristics of spontaneous reattachment of rhegmatogenous retinal detachment (SRRRD). Retrospective observational case series. Fifteen patients who were diagnosed with SRRRD. The medical records of 15 patients were reviewed. Spontaneous reattachment of rhegmatogenous retinal detachment was confirmed via serial observation in 4 of the eyes, and the remaining eyes represented patients in whom the condition was presumed to develop. Clinical features and association. This study involved 6 male patients and 9 female patients with a mean age of 48.0 years. The mean refractive errors in the involved and contralateral eyes were -5.0 and -5.3 diopters, respectively. All 15 eyes evidenced diffuse retinal pigmentary alterations within a sharply demarcated and convex margin. The lesions were located in the inferior retina in 10 of the 15 eyes, limited to 6 clock hours or fewer (66.7%). Although subretinal gliotic bands were detected within the lesion in 11 patients (73.3%), epiretinal proliferation was evident in only 2 patients (13.3%). Retinal changes associated with rhegmatogenous retinal detachment were noted in the fellow eyes of 7 patients (46.7%). Spontaneous reattachment of rhegmatogenous retinal detachment should be included in differential diagnoses of patients with diffuse retinal pigmentary alterations within a sharply demarcated convex margin in unilateral eyes. Small retinal breaks observed in nonvitrectomized eyes may be associated with the occurrence of SRRRD.
    Ophthalmology 04/2007; 114(3):581-6. · 5.56 Impact Factor
  • Song Ee Chung, Seong Eun Kyung, Sei Yeul Oh
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    ABSTRACT: To evaluate the clinical features of strabismus that present after cataract surgery and determine the motor and sensory results after surgical correction of the strabismus. Department of Ophthalmology, the Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. Thirty-one patients who had strabismus surgery after cataract surgery between January 1996 and June 2004 were included in the study. The clinical features of strabismus and the factors contributing to successful strabismus surgery results were retrospectively analyzed. Sensory functional tests were performed postoperatively. Fifteen patients (48.4%) had exotropia. The types of cataract included traumatic (35.5%), congenital (32.3%), and senile (25.8%). Prolonged deviation was the statistically significant factor contributing to final alignment (P = .023). Fourteen of 31 patients had stereoacuity measurement; all achieved a stereoacuity of 3000 seconds of arc. Five of the 14 patients (35.7%) had better than 200 seconds of arc. The anatomical results and sensory function of the patients were generally good. When appropriate, surgical intervention to treat strabismus after cataract surgery should be offered, and this is important for restoration of fusion.
    Journal of Cataract and Refractive Surgery 03/2007; 33(2):297-300. · 2.53 Impact Factor

Publication Stats

201 Citations
39.99 Total Impact Points

Institutions

  • 2007–2012
    • Sungkyunkwan University
      • Department of Ophthalmology
      Sŏul, Seoul, South Korea
  • 2011
    • Ewha Womans University
      • School of Medicine
      Seoul, Seoul, South Korea
  • 2010
    • Hanyang University Medical Center
      Sŏul, Seoul, South Korea