Won Choi

Chonnam National University, Gwangju, Gwangju, South Korea

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Publications (15)20.37 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To compare the treatment effects of topical cyclosporine A (CsA) and diquafosol sodium (DQS) for the treatment of moderate to severe dry eye disease (DED). This prospective, nonrandomized, comparative study involved 60 eyes of 60 patients with moderate to severe DED who were treated with topical CsA 0.05% (group 1, 31 patients) or DQS 3% (group 2, 29 patients) in addition to artificial tears for 3 months. Before treatment, and at 1 and 3 months after treatment, the Ocular Surface Disease Index, tear breakup time, Schirmer score, tear clearance rate, and corneal and conjunctival staining scores were compared. Significant improvements in Ocular Surface Disease Index score, tear clearance rate, and corneal staining score were observed 1 month after treatment in group 2 (p = 0.014, p = 0.002, and p < 0.001, respectively), when compared with group 1. However, no significant differences were observed between the two groups 3 months after treatment (p > 0.05). Tear breakup times were significantly higher in group 2 compared with group 1 for the duration of the study (p < 0.001). Three months after treatment, Schirmer score was significantly higher and conjunctival staining score was significantly lower in group 1 compared with group 2 (p < 0.001). Both topical CsA 0.05% and DQS 3% are effective in patients with moderate to severe DED. However, the timing and degree of therapeutic effects on tear film and ocular surface parameters, as well as symptoms, can be different between the two treatments.
    Optometry and vision science: official publication of the American Academy of Optometry 06/2015; DOI:10.1097/OPX.0000000000000657 · 2.04 Impact Factor
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    ABSTRACT: To compare the effects of ketorolac 0.45% and diclofenac 0.1% on macular thickness and volume after uncomplicated cataract surgery. A total of 76 eyes of 76 patients who underwent uncomplicated cataract surgery were included. Patients were treated with either diclofenac 0.1% (38 eyes) or ketorolac 0.45% (38 eyes) after surgery. The macular thickness and volume were obtained with optical coherence tomography (OCT). Central subfield thickness (CST, OCT 1 mm zone), total foveal thickness (TFT, OCT 3 mm zone), total macular thickness (TMT, OCT 6 mm zone), average macular thickness (AMT) and total macular volume (TMV) were compared between the two study groups. No significant differences between groups were found in macular thickness or volume 1 month after cataract surgery. Two months after surgery, the ketorolac group had significantly lower CST, TFT, TMT and AMT than the diclofenac group (p < 0.05 for all). Additionally, 1 and 2 months after surgery, changes from preoperative values in CST (both p = 0.04), AMT (p = 0.02 and p < 0.01, respectively) and TMV (both p = 0.04) were significantly less in the ketorolac group than in the diclofenac group. Following uncomplicated cataract surgery, topical ketorolac 0.45% was more effective than diclofenac 0.1% in preventing increases in macular thickness and volume. © 2015 Acta Ophthalmologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.
    Acta ophthalmologica 06/2015; DOI:10.1111/aos.12780 · 2.51 Impact Factor
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    ABSTRACT: To investigate the efficacy of topical 5-aminoimidazole-4-carboxamide-1-β-d-ribofuranoside (AICAR) in a mouse model of experimental dry eye (EDE). Eye drops consisting of 0.001% or 0.01% AICAR, 0.05% cyclosporine A (CsA), or balanced salt solution (BSS) were applied for the treatment of EDE. Tear volume, tear film break-up time (BUT), and corneal fluorescein staining scores were measured 10 days after treatment. Levels of interleukin (IL)-1β, IL-6, tumor necrosis factor (TNF)-α, interferon (IFN)-γ, interferon gamma-induced protein 10 (IP-10), and monokine induced by interferon-γ (MIG) were measured in the conjunctiva. In addition, Western blot, periodic acid-Schiff staining for evaluating goblet cell density, flow cytometry for counting the number of CD4+CXCR3+ T cells, and immunohistochemistry for detection of 4-hydroxy-2-nonenal (4HNE) were performed. Mice treated with 0.01% AICAR showed a significant improvement in all clinical parameters compared with the EDE control, vehicle control, and 0.001% AICAR groups (P < 0.001). A significant decrease in the levels of IL-1β, IL-6, TNF-α, IFN-γ, IP-10, and MIG, the number of CD4+CXCR3+ T cells, and the number of 4HNE-positive cells were also observed in the 0.01% AICAR group (P < 0.001). Although 0.05% CsA also led to an improvement in clinical parameters and inflammatory molecule levels, its therapeutic effects were comparable or inferior to those of 0.01% AICAR. Topical application of 0.01% AICAR can markedly improve clinical signs and decrease inflammation in the ocular surface of EDE, suggesting that AICAR eye drops may be used as a therapeutic agent for dry eye disease.
    Investigative ophthalmology & visual science 05/2015; 56(5):3149-3158. DOI:10.1167/iovs.14-16153 · 3.66 Impact Factor
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    ABSTRACT: A 72-year-old man with no medical history initially presented to the emergency room with severe tearing, redness, foreign body sensation, and pain in the left eye. He reported no previous history of any periocular trauma, malignancy, surgery, or systemic illness. On presentation, the patient only showed left periorbital edema and erythema in the left eyelid with no evidence of any skin malignancy. On slit lamp examination, multiple small whitish motile organisms were observed on the left conjunctival fornices. The organisms were removed, preserved, and identified as the third-stage larvae of Lucilia sericata (green bottle fly). The patient was treated with topical antibiotic and steroid eye drops and the inflammation resolved 1 week after treatment initiation. This is the first report of external ophthalmomyiasis caused by facultative parasite, L. sericata maggots in a healthy patient without any predisposing factors. Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.
    Parasitology International 03/2015; 64(5). DOI:10.1016/j.parint.2015.03.002 · 2.11 Impact Factor
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    ABSTRACT: : To investigate the efficacy of a topical anti-tumor necrosis factor-α agent, infliximab, in a mouse model of experimental dry eye (EDE). : EDE was induced in C57BL/6 mice, with or without topical treatment consisting of balanced salt solution or 0.001%, 0.01%, or 0.1% infliximab solutions. Tear volume and corneal smoothness were measured on days 5 and 10 after treatment. Levels of interleukin (IL)-1β, IL-6, IL-17, and interferon γ (IFN-γ) were measured in the conjunctiva using a multiplex immunobead assay 10 days after treatment. Periodic acid-Schiff staining, immunohistochemistry, and flow cytometry were also performed 10 days after treatment. : Mice treated with 0.01% or 0.1% infliximab showed a significant improvement in tear volume and corneal smoothness compared with controls. The 0.01% and 0.1% infliximab-treated groups showed decreased levels of conjunctival IL-1β, IL-6, IL-17, and interferon γ and a decreased staining intensity of tumor necrosis factor-α. The density of conjunctival goblet cells was higher, whereas the number of CD4CXCR3 T cells was lower, in the 0.01% and 0.1% infliximab-treated groups compared with the EDE and balanced salt solution control groups. However, there was no significant difference in all parameters between the 0.001% infliximab-treated group and control group. : Topical application of infliximab can improve tear production and ocular surface irregularity, decrease inflammatory cytokines and cells on the ocular surface, and increase conjunctival goblet cell density. These results suggest that topical infliximab eye drops at a concentration of 0.01% and 0.1% may be useful for the treatment of dry eye disease.
    Cornea 11/2012; 31 Suppl 1:S25-31. DOI:10.1097/ICO.0b013e31826a80ea · 2.36 Impact Factor
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    ABSTRACT: To evaluate the expression of CCR5 and its ligands CCL3, CCL4, and CCL5 in the tear film and ocular surface and their correlation with disease severity in patients with dry eye disease. The concentrations of CCL3, CCL4, and CCL5 were measured using enzyme-linked immunosorbent assay in tear samples obtained from forty-three patients with dry eye (17 SS and 26 non-SS patients) and 20 control subjects. The correlation between chemokine levels and tear film and ocular surface parameters was analyzed. Expression of the chemokines and their receptor in the conjunctiva was evaluated using immunohistochemistry. Flow cytometry was performed to detect CCR4+CD4+, CCR5+CD4+, and CCR6+CD4+ cells in the conjunctiva. The concentrations of CCL3, CCL4, and CCL5 were 25.3 ± 24.2, 4.65 ± 3.21, and 93.12 ± 26.31 pg/mL in control subjects, 92.33 ± 13.23, 263.13 ± 116.13, and 253.64 ± 46.29 pg/mL in patients with non-SS, and 215.56 ± 36.1, 697.85 ± 185.65, and 456.12 ± 92.82 pg/mL in patients with SS. The concentrations showed a significant increase in tears of SS patients compared with those of non-SS patients and control subjects (p < 0.05). CCL5 levels showed significant correlation with tear film break-up time, basal tear secretion, tear clearance rate, keratoepitheliopathy score, and goblet cell density (p < 0.01). Staining for the chemokines and their receptor increased in dry eye patients, especially in those with SS patients. Flow cytometry demonstrated increased numbers of CCR5+CD4+, and CCR6+CD4+ cells in dry eye patients in contrast to CCR4+CD4+ cells. Expression of CCR5 and its ligands CCL3, CCL4, and CCL5 increase in the tear film and ocular surface of patients with dry eye syndrome, especially in those with SS. CCL5 levels correlate significantly with various tear film and ocular surface parameters.
    Current eye research 01/2012; 37(1):12-7. DOI:10.3109/02713683.2011.622852 · 1.66 Impact Factor
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    ABSTRACT: To investigate the prevalence and clinical aspects of Sjögren syndrome in patients who were diagnosed with dry eye syndrome in Korea.
    Journal of the Korean Ophthalmological Society 01/2012; 53(4):499. DOI:10.3341/jkos.2012.53.4.499
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    ABSTRACT: PuRPOSE: To investigate the severity and duration of desiccating stress-induced dry eye disease between mice with and without a genetic predisposition to spontaneous autoimmunity. Experimental dry eye was induced in 12- to 16-week-old wild-type C57BL/6 and autoimmune NOD.B10.H2(b) mice by subcutaneous injection of scopolamine with exposure to an air draft for 10 days. Tear volume and corneal smoothness were measured at baseline, 5 and 10 days after desiccating stress, and 3, 7, 14, and 28 days after the removal of desiccating stress. Periodic acid-Schiff staining and immunohistochemistry were performed to evaluate the densities of conjunctival goblet cells and CD4(+) T cells in each group. Interleukin (IL)-1β and IL-6 concentrations in conjunctival tissues were measured by multiplex immunobead assay. Signs of experimental dry eye were noted at 5 and 10 days after desiccating stress in both strains. After the removal of desiccating stress, in C57BL/6 mice, tear production and corneal smoothness improved at 3 and 7 days, respectively, and conjunctival goblet cells and CD4(+) T-cell densities and cytokine levels returned to baseline levels at 14 days. In contrast, in NOD.B10.H2(b) mice, none of the parameters recovered to baseline levels during a period of 28 days after the removal of desiccating stress. After the removal of desiccating stress in experimental dry eye, tear volume and ocular surface parameters recovered within 2 weeks in C57BL/6 mice, whereas they remained unchanged in NOD mice. In contrast to autoimmune mice, experimental dry eye can be reversed after the elimination of desiccating stress in nonsusceptible mice.
    Investigative ophthalmology & visual science 08/2011; 52(10):7267-73. DOI:10.1167/iovs.11-7231 · 3.66 Impact Factor
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    ABSTRACT: We report on a case of necrotizing keratoscleritis in primary Sjogren's syndrome. A 66-year-old female patient who was complaining of ocular pain, tearing and decreased vision in her right eye for the previous two days was admitted to our hospital. Visual acuity in the right eye was hand movement, and initial examination showed a 3.0 × 1.8 mm uveal mass bulging through a corneoscleral melting site in the nasal region of the right eye. Positive anti-nuclear antibody was identified at a titer of 1:320 with a speckled pattern, and both Sjogren's syndrome A and Sjogren's syndrome B antibody tests were positive, with titers >200 U/mL. A technetium 99m pertechnetate salivary scan revealed chronic sialoadenitis in the submandibular glands. We diagnosed the lesion as necrotizing keratoscleritis due to primary Sjogren's syndrome. A corneoscleral patch graft was performed, followed by immunosuppression including oral cyclosporin and topical prednisolone. During a follow-up period of 12 months, the corneoscleral graft was well maintained with no recurrence.
    Korean Journal of Ophthalmology 08/2011; 25(4):275-7. DOI:10.3341/kjo.2011.25.4.275
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    ABSTRACT: To investigate the efficacy of umbilical cord serum eyedrops for the treatment of patients with recurrent corneal erosions. Thirty-five eyes of 35 patients with recurrent corneal erosions were studied. Eighteen eyes were treated with 20% umbilical cord serum eyedrops in addition to artificial tears (group A), and 17 eyes received artificial tears only (group B). Frequency of recurrence of corneal erosions was compared between the 2 groups. The study included 17 male and 18 female patients. Mean age was 46.6 ± 13.4 years, and mean follow-up duration was 14.7 ± 2.5 months. No significant differences in age, sex, and follow-up duration were observed between the 2 groups. In group A, recurrence occurred 2 times in 3 eyes, 1 time in 3 eyes, and did not occur in 12 eyes. In group B, recurrence occurred 5 times in 1 eye, 3 times in 5 eyes, 2 times in 8 eyes, 1 time in 2 eyes, and did not occur in 1 eye. The mean frequency of recurrence was 0.50 ± 0.79 (0.04 ± 0.07 per month) in group A and 2.24 ± 1.09 (0.15 ± 0.08 per month) in group B (P < 0.01). No significant complications associated with serum use were observed. In the treatment of recurrent corneal erosions, umbilical cord serum eyedrops may be effective in reducing the number of recurrences.
    Cornea 03/2011; 30(7):744-8. DOI:10.1097/ICO.0b013e31820d850f · 2.36 Impact Factor
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    ABSTRACT: To investigate the expression of CCL5/RANTES (regulated upon activation, normal T cell expressed and secreted) in the tears of dry eye patients.
    Journal of the Korean Ophthalmological Society 01/2011; 52(6):658. DOI:10.3341/jkos.2011.52.6.658
  • Won Choi · Kyung-Chul Yoon
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    ABSTRACT: To evaluate the efficacy of topical 0.1% sodium hyaluronate (HA) and 0.05% cyclosporine A (CsA) on tear film parameters after cataract surgery.
    Journal of the Korean Ophthalmological Society 01/2011; 52(7):800. DOI:10.3341/jkos.2011.52.7.800
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    ABSTRACT: The present study was performed to evaluate the changes in tear film and ocular surface parameters after using sodium hyaluronate (SH) 0.1% alone or in combination with cyclosporine A (CsA) 0.05% in patients with thyroid-associated ophthalmopathy accompanied by dry eye.
    Journal of the Korean Ophthalmological Society 01/2010; 51(10):1319. DOI:10.3341/jkos.2010.51.10.1319
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    ABSTRACT: To evaluate the therapeutic effect of the combined treatment of excision of the papillae and a supratarsal injection of triamcinolone on refractory vernal keratoconjunctivitis (VKC).
    Journal of the Korean Ophthalmological Society 01/2010; 51(4). DOI:10.3341/jkos.2010.51.4.492
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    ABSTRACT: A 52-year-old man was admitted to the hospital after complaining of visual disturbance and ocular pain after the explosion of a tire. An examination revealed a 10-mm-sized medial scleral perforation with uveal tissue prolapse and hyphema. Computed tomography (CT) revealed a highly attenuated foreign body 2.0×1.2 cm in size in the intraconal space. Surgery was performed to remove the stone. Primary repair of the scleral perforation and of the partially ruptured medial rectus muscle was also done. We report a case of the successful management of an intraconal stone.
    Chonnam Medical Journal 01/2009; 45(2):140-143. DOI:10.4068/cmj.2009.45.2.140

Publication Stats

36 Citations
20.37 Total Impact Points

Institutions

  • 2010–2015
    • Chonnam National University
      • Department of Ophthalmology
      Gwangju, Gwangju, South Korea
  • 2011–2012
    • Chonnam National University Hospital
      Sŏul, Seoul, South Korea
  • 2009
    • Seonam University
      Onyang, South Chungcheong, South Korea