Publications by authors named "Ryo Obata"

Article Synopsis
  • The study aimed to simulate and evaluate how disease stage, VF test frequency, clustering, and eye inclusion impact sample size calculations in retinitis pigmentosa clinical trials.
  • VF tests were conducted across different disease stages, measuring the probability of detecting significant treatment effects at various levels, with data collected over approximately two years.
  • Results indicated that using only one eye could significantly reduce the required sample size for detecting treatment differences, especially in moderate disease stages, while early disease stages and including both eyes also influenced this requirement.
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Article Synopsis
  • A 71-year-old man had a unique case where drusen (yellowish spots in the eye) resolved while an eccentric full-thickness macular hole (a defect in the retina) closed on its own.
  • The patient showed improvement as the macular hole closed without any surgical intervention, and the vision stayed stable during the follow-up.
  • This case highlights the possibility of drusen regression coinciding with spontaneous macular hole closure, contributing to our knowledge of eye conditions and treatment options.
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Purpose: To investigate the association between white-coat hypertension (WCH) and acute retinal vein occlusion (RVO).

Methods: In this retrospective case-control study, patients aged 40 years or older diagnosed with acute-phase RVO were included. Patients with other pathologies served as non-RVO controls.

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Purpose: To investigate the association between the time from onset to initial treatment and changes in visual acuity or the number of treatments in patients with branch retinal vein occlusion (BVO).

Design: Retrospective.

Methods: Thirty-nine eyes of 39 consecutive patients with untreated acute-phase BVO who visited the University of Tokyo Hospital and were followed up for at least one year were included.

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This retrospective study aimed to investigate the progression of central retinal vein occlusion (CVO) prior to treatment initiation and its impact on prognosis. Of the 54 studied eyes with acute CVO, the average logMAR visual acuity (VA) at the initial visit was 0.65 ± 0.

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Background: Long-term results of photodynamic therapy (PDT) combined with vascular endothelial growth factor (VEGF) inhibitors for pachychoroid neovasculopathy (PNV) are not yet clear.

Methods: This study is a retrospective, observational case series. We retrospectively examined untreated PNV cases (22 cases, 22 eyes, mean age of 71.

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There are limited reports on patients with Trousseau syndrome, a condition characterized by hypercoagulability associated with malignant tumors, initially manifesting with reduced visual function. We present a case of a patient who experienced bilateral vision loss and was subsequently diagnosed with Trousseau's syndrome following examination and investigations. A 70-year-old man, undergoing chemotherapy for advanced pancreatic cancer, reported decreased visual acuity in both eyes.

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Purpose: Non-surgical closure of a full-thickness macular hole (FTMH) with eye drops has recently been reported, but there are few similar reports in cases with pathologic myopia.

Case Presentation: (Case 1) The right eye of a 75-year-old female with an axial length of 28.83 mm had undergone anti-vascular endothelial growth factor (VEGF) treatment for choroidal neovascularization presented with FTMH.

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Purpose: To describe clinical characteristics of a retinal finding termed mound-like epiretinal material (MOLEM), and distinguish it from epiretinal proliferation, a similar epiretinal finding previously described in various pathologies.

Methods: Five eyes from five patients were retrospectively identified from medical records. Clinical findings and images, including fundus photographs and optical coherence tomography (OCT), were reviewed.

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Introduction: The EVEREST II study previously reported that intravitreally administered ranibizumab (IVR) combined with photodynamic therapy (PDT) achieved superior visual gain and polypoidal lesion closure compared to IVR alone in patients with polypoidal choroidal vasculopathy (PCV). This follow-up study reports the long-term outcomes 6 years after initiation of the EVEREST II study.

Methods: This is a non-interventional cohort study of 90 patients with PCV from 16 international trial sites who originally completed the EVEREST II study.

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Purpose: To examine the long-term visual outcomes after initial treatment with combined photodynamic therapy (PDT) or aflibercept treat-and-extend (TAE) monotherapy in patients with pachychoroid neovasculopathy (PNV).

Methods: Patients diagnosed with PNV, initially treated with PDT combined with anti-vascular endothelial growth factor (VEGF) or intravitreal aflibercept (IVA) monotherapy in the TAE protocol and followed up for at least 6 months, were included in the study. Medical records were retrospectively reviewed.

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Purpose: Recent evidence suggests that venous congestion at the vortex vein significantly contributes to the development of central serous chorioretinopathy (CSCR), and sclera is observed to be thicker in affected eyes. This study aims to investigate whether eyes with CSCR exhibit stiff corneas, measured using Corneal Visualization Scheimflug Technology (Corvis ST), which may serve as an indicator of scleral stiffness.

Methods: This retrospective case-control study comprises 52 eyes from 33 patients diagnosed with CSCR and 52 eyes from 32 normal controls without CSCR.

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A 29-year-old female with no family history presented with bilateral progressive blurred vision. Her symptoms appeared at 12-years-old and her visual acuity had since deteriorated from 0.6 to 0.

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To analyze the long-term visual outcomes of pachychoroid spectrum diseases (PSD). Retrospective study. We reviewed the medical charts of consecutive patients with PSD, including focal choroidal excavation (FCE), pachychoroid pigment epitheliopathy (PPE), central serous chorioretinopathy (CSC), and pachychoroid neovasculopathy (PNV).

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The present study aimed to compare retinal sensitivity (RS) at each stage and to evaluate the relationship between RS and fundus autofluorescence (FAF) pattern in adult-onset foveomacular vitelliform dystrophy (AOFVD). We retrospectively reviewed 17 eyes of 13 patients with AOFVD. In addition to best-corrected visual acuity (VA), RS within the affected lesion and optical coherence tomography (OCT) measurements were carried out in each participant.

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Limited information regarding the anatomical and visual prognosis of macular telangiectasia (MacTel) type 2 in the Asian population is currently available. Herein, we conducted a retrospective longitudinal analysis of Japanese patients diagnosed with MacTel type 2. Disease progression was evaluated using the Simple MacTel Classification developed by Chew EY et al.

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Background: Gonadal hormones function in the retina; however, their targets have not yet been identified. Therefore, the present study examined the effects of progesterone and other gonadal hormones on glutamatergic circuits in the retina.

Methods: Extracellular glutamate concentrations, which correspond to the amount of glutamate released, were examined using an enzyme-linked fluorescent assay system.

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Purpose: To investigate the clinical validity of the Guided Progression Analysis definition (GPAD) and cluster-based definition (CBD) with the Humphrey Field Analyzer (HFA) 10-2 test in retinitis pigmentosa (RP).

Methods: Ten non-progressive RP visual fields (VFs) (HFA 10-2 test) were simulated for each of 10 VFs of 111 eyes (10 simulations × 10 VF sequencies × 111 eyes = 111,000 VFs; Dataset 1). Using these simulated VFs, the specificity of GPAD for the detection of progression was determined.

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Background: We investigated the effect of the number of laser shots applied on the myopic variables to elucidate the mechanism of myopia development in laser-treated retinopathy of prematurity (ROP) eyes.

Methods: A total of 33 eyes of 17 infants with ROP who underwent laser treatment were included in the analysis. Cycloplegic retinoscopic refraction testing was carried out and the spherical equivalent (SE) was calculated.

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Purpose: To identify the inflammatory cytokine profile in the aqueous humor (AH) of patients with intraocular inflammation (IOI) after intravitreal administration of brolucizumab (IVBr) for neovascular age-related macular degeneration.

Methods: Eight eyes from seven patients with IOI after initial IVBr (IVBrIOI +) were enrolled. Sixteen eyes from 16 patients without IOI after IVBr (IVBrIOI -) and aflibercept (IVA) were used as controls.

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Purpose: To clarify recent trends in the use of intravitreal injections of anti-vascular endothelial growth factor (VEGF) in Japan.

Study Design: Retrospective cohort study.

Methods: We used the DeSC database, a large-scale claims database for Japan, for entries between April 2014 and March 2021.

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Article Synopsis
  • - The study aimed to explore the genetic factors linked to age-related macular degeneration (AMD) specifically within a Japanese population by conducting a genome-wide association study (GWAS).
  • - Researchers analyzed data from nearly 4,000 AMD patients and over 16,000 controls, identifying six genetic loci significantly associated with AMD, including two novel loci not previously linked to the disease.
  • - The findings also revealed that these novel loci were associated with another eye condition, central serous chorioretinopathy (CSC), suggesting potential shared genetic mechanisms between AMD and CSC.
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Objective: This study aimed to investigate the anatomical and functional changes in patients with central retinal artery occlusion (CRAO) (n=21) treated with 10 µg/day intravenous liposomal prostaglandin E1 (lipo-PGE1).

Methods And Analysis: We used best-corrected visual acuity (BCVA), central retinal thickness with spectral domain optical coherence photography, optical intensity ratio (OIR) with imageJ software and retinal vessel diameter with fundus photography as indicators. Data were analysed using Tukey's multiple comparisons, Wilcoxon test or Spearman's correlation analysis as appropriate.

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Backgrounds/objectives: The threshold of hypertension was lowered from systolic blood pressure (SBP)/diastolic blood pressure (DBP) 140/90 mmHg to 130/80 mmHg by the 2017 American College of Cardiology/American Heart Association blood pressure (BP) guideline. Thus, we investigated the association between retinal vein occlusion (RVO) occurrence and early-stage hypertension.

Subjects/methods: This retrospective cohort study used the JMDC Claims Database (JMDC Inc.

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Purpose: To characterize the findings of eyes with choroidal vascular hyperpermeability (CVH), a hallmark of central serous chorioretinopathy, using multimodal imaging and investigate the locational agreement between these findings and CVH.

Methods: Among patients with central serous chorioretinopathy in either eye, eyes with CVH identified using indocyanine green angiography without exudative changes were included. All eyes were examined using funduscopy, fluorescein angiography, spectral-domain optical coherence tomography, and short-wavelength or near-infrared autofluorescence (SWAF or NIRAF).

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Synopsis of recent research by authors named "Ryo Obata"

  • - Ryo Obata's recent research primarily focuses on various ocular conditions, examining treatment outcomes and associations, particularly related to retinal vein occlusion and macular diseases.
  • - Significant findings include the correlation between treatment timeliness and visual outcomes in retinal vein occlusion cases, along with unique observations of macular drusen resolution linked to macular hole closure.
  • - The studies also explore innovative treatment methodologies, such as non-surgical closure of macular holes and long-term effects of combined therapies for pachychoroid neovasculopathy, indicating a comprehensive approach to addressing complex retinal disorders.