Publications by authors named "Chan Yun Kim"

This study investigates the effects of bevacizumab, a common vascular endothelial growth factor (VEGF) inhibitor, in treating ocular neovascular disorders, with a focus on its impact on retinal ganglion cell (RGC) survival. Given that bevacizumab has been associated with adverse effects on RGCs, we aimed to validate these reports, identify an alternative VEGF inhibitor with similar antiangiogenic efficacy but without detrimental effects on RGCs, and explore the underlying mechanisms. Using primary RGCs extracted from neonatal rats and human umbilical vascular endothelial cells (HUVECs), we compared the efficacy of bevacizumab with other VEGF inhibitors and assessed the apoptotic effects and cell survival pathways influenced by these treatments.

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Purpose: To identify the risk of depression in individuals exposed to persistent blue light deprivation through blue light-filtering (BLF) intraocular lenses (IOLs) based on previous studies that found blue light to promote affective arousal and modulate emotional responses.

Design: Population-based cohort analysis.

Participants: Individuals who underwent cataract removal and IOL implantation in both eyes within 1 year between January 2012 and December 2018.

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The Asia-Pacific Glaucoma Society (APGS), in collaboration with the Academy of Asia-Pacific Professors of Ophthalmology (AAPPO), convened a panel of 18 international experts from 10 countries/territories to identify areas of controversy and establish consensus on diagnosing and managing Acute Primary Angle Closure Attack (APACA). APACA is a relatively common and potentially vision-threatening ocular emergency, particularly in Chinese and Asian populations. With timely and appropriate intervention, favorable outcomes could be achieved.

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Long-term steroid use, though essential for treating eye diseases, can cause increased intraocular pressure (IOP) in susceptible individuals and may lead to steroid-induced glaucoma in a subset of patients. This study investigated the effect of bone morphogenetic protein-7 (BMP-7) on steroid-induced extracellular matrix (ECM) synthesis in human trabecular meshwork (TM) cells. We sought to explore the potential of BMP-7 as a protective agent against steroid-induced ECM accumulation in the TM.

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Purpose: This study investigated the changes in gene expression in retinal ganglion cells (RGCs) following ciliary neurotrophic factor (CNTF) treatment to elucidate the underlying mechanisms contributing to its neuroprotective effects.

Methods: RGCs isolated from Sprague-Dawley rat pups were treated with recombinant CNTF. Gene expression was analyzed via microarray.

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Background: To assess the association between patients with normal tension glaucoma (NTG) and the risk of obstructive sleep apnoea (OSA) using the STOP-Bang questionnaire.

Methods: A population-based cross-sectional analysis was performed using data from the Korean National Health and Nutrition Examination Survey from 2019 to 2021. An overall of 8832 subjects ≥ 40 years of age were investigated.

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This study evaluates the safety and visual outcomes of enhanced monofocal intraocular lenses compared to standard monofocal intraocular lenses in patients with varying severities of glaucoma. Utilizing data from surgeries performed in 2021, the study involved patients aged 40 and older with visually significant cataracts and diagnosed glaucoma or glaucoma suspects. The findings indicate that both enhanced and standard monofocal lenses lead to significant improvements in best-corrected visual acuity, visual field index, mean deviation, and retinal nerve fiber layer thickness postoperatively.

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Purpose: Descemet membrane endothelial keratoplasty (DMEK) has emerged as a novel approach in corneal transplantation over the past two decades. This study aims to identify predisposing risk factors for post-DMEK ocular hypertension (OHT) and develop a preoperative predictive model for post-DMEK OHT.

Methods: Patients who underwent DMEK at Gangnam Severance Hospital between 2017 and 2024 were included in the study.

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Background: The present study aims to identify the relationship between longitudinal changes in corneal hysteresis (CH) and progressive retinal nerve fibre layer (RNFL) thinning in a cohort of medically controlled, early-to-moderate open-angle glaucoma (OAG) patients with a history of laser refractive surgery (LRS).

Methods: A total of 123 consecutive eyes with a diagnosis of medically controlled (peak intraocular pressure (IOP)<18 mm Hg), early-to-moderate OAG with a history of LRS underwent measurements of CH, corneal-compensated intraocular pressure (IOPcc) and RNFL thicknesses every 6 months. Linear models were used to investigate the relationship between CH change and RNFL thickness change over time.

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Article Synopsis
  • The study compared clinical outcomes of Xen 45 gel stent surgery and trabeculectomy in glaucoma patients, analyzing data from 62 eyes treated with Xen and 78 eyes with trabeculectomy over specific periods.
  • Results showed a lower complete success rate for Xen (33.9%) compared to trabeculectomy (57.7%), along with higher postoperative intraocular pressure and more glaucoma medications needed in the Xen group; however, it had fewer complications (0% vs. 16.7%) and shorter operation time.
  • Both surgical methods yielded similar postoperative best corrected visual acuity but differed in success rates, medication requirements, and safety profiles, indicating that while Xen may be quicker and safer
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Purpose: To determine the risk of optic neuritis (ON) during nonpharmaceutical interventions (NPI), vaccination, and infection phases of the coronavirus disease 2019 (COVID-19) pandemic in comparison with levels before the outbreak in pediatric and adult populations in South Korea.

Design: A nationwide, population-based retrospective study.

Participants: South Korean individuals with a primary diagnosis of ON received between January 2017 and December 2022.

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Article Synopsis
  • The study focused on understanding steroid-induced ocular hypertension (SIOH) to minimize vision loss risk and improve safety for dexamethasone (DEX) injections.
  • Researchers conducted a retrospective study with 154 eyes to create a predictive nomogram that incorporates trabecular meshwork (TM) height as a new risk factor for SIOH.
  • The new nomogram showed significantly better accuracy in predicting SIOH risk compared to previous models, providing safety thresholds to identify individuals who may need more cautious approaches to DEX treatment.
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Article Synopsis
  • The study aimed to understand how systemic arterial stiffness and choroidal microvascular insufficiency affect the progression of normal-tension glaucoma (NTG).
  • Researchers conducted a retrospective cohort study on 107 early NTG eyes, analyzing factors like pulse wave velocity (PWV) and choroidal microvasculature dropout (MvD) over an average follow-up of about 48 months.
  • Results showed that eyes with both choroidal MvD and high PWV experienced significantly faster thinning of certain retinal layers, indicating that combined vascular issues may lead to quicker structural damage in NTG despite low eye pressure.
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Purpose: To evaluate the baseline intraocular pressure (IOP)-related risk of severe steroid-induced ocular hypertension (SIOH). We hypothesized that the incidence and severity of SIOH may differ according to baseline IOP in patients who received intravitreal dexamethasone implants.

Methods: A total of 889 eyes treated with intravitreal dexamethasone implants and a baseline IOP of ≤ 23 mmHg were enrolled.

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The purpose of this study was to identify the effect of antihypertensive medication on risks of open-angle glaucoma (OAG) among patients diagnosed with hypertension (HTN). A total of 5,195 patients, who were diagnosed with HTN between January 1, 2006 and December 31, 2015, and subsequently diagnosed with OAG, were selected for analysis. For each OAG patient, 5 non-glaucomatous, hypertensive controls were matched (n = 25,975) in hypertension diagnosis date, residential area, insurance type and economic status.

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Purpose: The purpose of this study was to identify possible associations between obstructive pulmonary function and macular structure parameters on optical coherence tomography (OCT) and angiography in subjects without glaucomatous optic neuropathy.

Methods: A total of 70 patients were prospectively enrolled from June to December 2021 as a part of All About Life Yongin-Pulmonary/Psychiatry, Rehabilitation, Eye (AALY PRE) cohort in Yongin Severance Hospital. Patients underwent intraocular pressure (IOP), visual acuity measurements, cirrus OCT, OCT angiography, and pulmonary function testing (PFT) on the same day.

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Objective: The study attempted to identify clinical characteristics associated with structural progression in open-angle glaucoma (OAG) in the presence of MvD in different locations.

Methods: A total of 181 consecutive OAG eyes (follow-up 7.3 ± 4.

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Prcis: Glaucoma eyes with a small cup-to-disk ratio (CDR) tend to show retinal nerve fiber layer progression earlier than ganglion cell-inner plexiform layer progression.

Purpose: To investigate the effects of clinical variables on the temporal relationship between macular ganglion cell-inner plexiform layer (mGCIPL) loss and peripapillary retinal nerve fiber layer (pRNFL) loss in glaucoma.

Methods: This retrospective observational study used medical records of patients diagnosed with open angle glaucoma.

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Purpose: To evaluate the effect of intraoperative mitomycin C (MMC) on the surgical outcomes of ciliary sulcus (CS) Ahmed glaucoma valve (AGV) tube placement.

Methods: A retrospective review of medical records of 54 consecutive patients who underwent AGV implantation with tube placed in CS was performed. Consecutive cases operated without the use of intraoperative MMC from 2017 to 2019 were compared with consecutive cases operated with MMC from 2019 to 2021.

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It is important to identify at-risk patients prior to administering steroid injections to prevent avoidable irreversible blindness inducted by steroid-induced ocular hypertension (SIOH). We aimed to investigate the association of SIOH following intravitreal dexamethasone implantation (OZURDEX) using anterior segment optical coherence tomography (AS-OCT). We conducted a retrospective case control study to assess the association between trabecular meshwork and SIOH.

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Article Synopsis
  • This study aimed to find peripapillary choroidal microvasculature dropout (MvD) in eyes with optic neuritis and how it relates to changes in retinal nerve fiber and ganglion cell thickness over time.
  • Researchers examined 48 eyes using OCTA and found MvD in 41.7% of cases, primarily in the temporal quadrant, leading to reduced retinal vessel density and thinner ganglion cell-inner plexiform layers at the 6 month mark.
  • The presence of MvD correlated with significant thinning in ganglion cell thickness, suggesting a link between microvascular impairment and retinal damage in optic neuritis; further research is recommended to clarify this relationship.
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Purpose: Hypertension (HTN) has been associated with open-angle glaucoma (OAG), but whether elevated blood pressure (BP) alone is associated with OAG is unknown. Whether stage 1 hypertension, as per the 2017 American College of Cardiology/American Heart Association (ACC/AHA) BP guidelines, increases the risk of the disease is uncertain.

Design: Retrospective, observational, cohort study.

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