Publications by authors named "Tadamichi Akagi"

Purpose: We present an ab interno removal technique combined with a needling procedure for a malpositioned Ex-PRESS glaucoma shunt.

Study Design: Retrospective case series.

Methods: This study examined four cases of malpositioned Ex-PRESS shunts.

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Purpose: To evaluate the impact of disc hemorrhages (DHs) at different locations on clustered visual field (VF) progression in patients with primary open-angle glaucoma (POAG) over a 3-year prospective study.

Design: A prospective multicenter cohort study.

Participants: Patients diagnosed with POAG and intraocular pressure (IOP) ≤18 mmHg undergoing prostaglandin analog monotherapy.

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Purpose: To examine the correlation of the spherical equivalent refraction (SER) and axial length with the visual field, and to determine cutoff values of SER and axial length for the risk of developing advanced primary open-angle glaucoma (POAG).

Methods: Patients with POAG or secondary glaucoma were retrospectively enrolled from a clinical database at Kyoto University Hospital between August 2011 and December 2018. Correlations between the mean deviation (MD) and axial length were evaluated in these patients using the Pearson's correlation coefficient.

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Purpose: To investigate the relationships among postoperative metamorphopsia and postoperative macular morphological changes and the duration from the onset of visual field disturbance to surgery (DVD) in patients who underwent surgery for macula-off rhegmatogenous retinal detachment (RRD).

Patients And Methods: We retrospectively reviewed 33 eyes of 33 patients who underwent pars plana vitrectomy (PPV) for macula-off RRD with known onset of symptoms of visual field disturbance at Niigata University Medical and Dental Hospital or Saiseikai Niigata Hospital and were followed up for at least 6 months postoperatively. Optical coherence tomography images of the macula obtained at 6 months postoperatively and DVD were analyzed, and the associations of the DVD with vertical metamorphopsia (vM) and horizontal metamorphopsia (hM) at 6 months postoperatively were evaluated using M-CHARTS.

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Background: We examined the relationship between contrast sensitivity (CS) and visual field stage/severity in patients with open-angle glaucoma (OAG), and correlated CS with Quality of Vision (QOV) scores.

Methods: CS was measured under photopic (100 cd) and mesopic (10 cd) conditions in 218 eyes of 109 patients with OAG aged < 60 years. The glaucoma stages were divided into four groups according to the mean deviation (MD) of the Humphrey Field Analyzer (HFA) 24 - 2 or 10 - 2 Swedish Interactive Thresholding Algorithm (SITA) standard, and their relationship with CS was examined.

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The effect of the Rho-kinase inhibitor ripasudil on the retinal optic nerve fiber layer (RNFL) remains unclear. We aimed to determine this effect in patients with primary open-angle glaucoma (POAG) using optical coherence tomography (OCT) measurements and linear mixed analysis. This study prospectively included outpatients from a single center with POAG without a history of vitreoretinal or glaucoma surgery from December 2014 to June 2020, in whom the circumpapillary RNFL thickness (cpRNFLT) was measured more than three times before and after ripasudil initiation, without additional medication or surgery during the period.

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Purpose: To evaluate the agreement between 24-2 visual field (VF) test results obtained using the gaze analyzing perimeter (GAP; Findex) and the Humphrey field analyzer (HFA; Carl Zeiss Meditec).

Design: Cross-sectional study.

Participants: Patients underwent HFA 24-2 for suspected or confirmed VF loss and were treated at the Kyoto University Hospital between December 2022 and July 2023.

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Purpose: To evaluate the surgical outcomes of intrascleral intraocular lens (IOL) fixation using ab interno trabeculotomy (LOT) in patients with exfoliation glaucoma with lens subluxation.

Study Design: Retrospective case series.

Methods: Twenty eyes of 18 patients with exfoliation glaucoma and lens or IOL subluxations were included.

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Purpose: We report a new bleb lining technique with Tenon's patch graft for late-onset leakage from large ischemic bleb with severe conjunctival scarring and impractical conjunctival mobilization after trabeculectomy.

Study Design: Retrospective case series.

Methods: This study includes six cases with late-onset leakage from large ischemic blebs.

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Article Synopsis
  • The study analyzes surgical outcomes of glaucoma patients treated with steroids, focusing on the impact of atopic dermatitis on success rates.
  • A total of 70 eyes from 46 patients were examined, revealing no significant difference in postoperative intraocular pressure between those with and without atopic dermatitis.
  • The key finding indicated that the number of preoperative medications was the only factor significantly affecting surgical success rates, suggesting that patients with higher medication use may face a greater risk of needing reoperation.
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The purpose of this study was to evaluate how various parameters are related to microvasculature dropout (MvD) area measured using optical coherence tomography angiography (OCTA). We measured the area of MvD in 55 patients with primary open-angle glaucoma (POAG). Using OCTA, MvD area and peripapillary choroidal atrophy (PPA) area were assessed in a 4.

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We conducted a study to assess the pressure difference between the aqueous and vitreous humors in rabbit eyes using a direct intraocular pressure (IOP) measurement method. A micro-optic-fiber pressure sensor was utilized for this purpose. Preliminary experiments with enucleated porcine eyes confirmed the sensor's accuracy in measuring both aqueous and vitreous humor pressure.

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  • The study assessed the impact of trabeculectomy with mitomycin C (Trab MMC) on visual field progression in patients with glaucoma and high myopia.
  • The research involved 35 eyes from 32 patients who had undergone Trab MMC, showing a significant reduction in intraocular pressure (IOP) post-surgery across both high myopic and non-highly myopic groups.
  • While IOP decreased and visual field deterioration slowed in both groups, the improvement was more pronounced in the non-highly myopic group compared to the highly myopic group, where the changes were not statistically significant.
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Purpose: This study aimed to introduce a new technique for lowering intraocular pressure (IOP) using a multi-stent system after the implantation of a Baerveldt glaucoma implant (BGI) and evaluate its clinical effectiveness.

Study Design: Prospective case series.

Methods: Six patients with uncontrolled refractory glaucoma were enrolled between December 2021 and May 2022.

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This study investigated the influence of asymmetric corneal hysteresis (CH) on asymmetric visual field impairment between right and left eyes in patients with primary open-angle glaucoma (POAG) without a history of intraocular surgery. CH, corneal resistance factor (CRF), and corneal compensated intraocular pressure (IOPcc) were measured using the Ocular Response Analyzer. Differences between the eyes (right eye-left eye: DIF) and CH-based and in target parameters (higher CH eye-lower CH eye: DIF) were calculated in the same patient.

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Article Synopsis
  • The study aimed to determine the number of visual field (VF) tests necessary to effectively predict future VF results in glaucoma patients and to assess various non-linear regression models' effectiveness in this prediction.
  • An analysis of 180 eyes from 133 patients was conducted using ordinary least squares linear regression (OLSLR) to forecast the first three future VFs, revealing that a minimum of 8 to 10 prior VFs were needed to ensure reliable projections.
  • The research found that non-linear models, such as quadratic and logistic regression, did not offer significant improvements over the OLSLR method in predicting future VF outcomes.
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  • The study examines how minimally invasive glaucoma surgery (MIGS) affects the blood vessels in the eye, specifically focusing on changes in the deep vascular layer post-surgery.
  • It was found that the deep vessel density (VD) significantly decreased in patients three months after TM-targeted MIGS, while superficial vessel density remained unchanged.
  • The reduction in deep VD was linked to lower intraocular pressure (IOP) and was more pronounced in patients who had successful surgical outcomes.
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Article Synopsis
  • Optical coherence tomography angiography (OCTA) is a non-invasive imaging technique used to assess blood vessels, and this study focused on its application in evaluating the post-surgery changes in filtering blebs after trabeculectomy.
  • The study involved 57 eyes from 53 patients treated with mitomycin C, examining complete avascular areas (CAAs) in images taken at 1, 3, and 6 months post-surgery, finding CAAs present in a significant number of cases.
  • While CAAs decreased over time following surgery, they did not show a significant correlation with the overall success of the surgical outcome, suggesting that AS-OCTA is more useful for assessing vascular changes rather than predicting surgery success.
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Purpose: To elucidate the noninferiority of ab interno microhook trabeculotomy (μTLO) using a recently developed reusable stainless spatula-type microhook device to incise the trabecular meshwork to Trabectome (Neomeix, Inc) surgery in terms of the 1-year postoperative outcomes of Japanese patients with glaucoma by means of propensity score analyses.

Design: Multicenter, retrospective cohort study.

Participants: We enrolled 553 and 392 patients who underwent Trabectome surgery and μTLO, respectively, between January 2014 and March 2020 at 10 facilities.

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Purpose: The purpose of this study was to image and investigate the foveal microstructure of human cone and Müller cells using adaptive optics-optical coherence tomography.

Methods: Six healthy subjects underwent the prototype adaptive optics-optical coherence tomography imaging, which allowed an axial resolution of 3.4 µm and a transverse resolution of approximately 3 µm.

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Article Synopsis
  • * The study included 37 patients, and we found that those with lower deep vascular densities (VDs) had better surgical outcomes and greater reductions in intraocular pressure (IOP).
  • * Our findings suggest that assessing intrascleral vasculature prior to MIGS can help predict the success rates and IOP changes after surgery.
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  • Purpose of the study was to explore the link between topical β-blockers and asthma attacks in glaucoma patients who have asthma.
  • Methods involved a retrospective analysis of health insurance claims, focusing on patients over 20 who were prescribed glaucoma eye drops between 2011 and 2017, comparing β-blocker users with non-users for asthma attack incidence.
  • Results showed lower asthma treatment rates in the β-blocker group compared to non-users, but the overall incidence of asthma attacks was not significantly higher among β-blocker users, suggesting that using these medications may be safe for asthma patients undergoing glaucoma treatment.
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Descemet's membrane detachment (DMD) is a rare but serious complication of phacoemulsification surgery. A small DMD may resolve spontaneously, but extensive DMD often requires intracameral injection of air, nonexpansile gases, or expansile gases. A 92-year-old man who underwent phacoemulsification and aspiration with intraocular lens placement in the right eye had significantly reduced visual acuity, with a hazy cornea after surgery.

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Background And Objective: Investigations of morphological changes in photoreceptors in Behçet's disease (BD) using adaptive optics scanning light ophthalmoscope (AOSLO) are lacking. The authors aimed to evaluate macular cone density and regularity in BD patients with or without a history of uveitis with good visual acuity (VA).

Patients And Methods: The authors included 16 patients (29 eyes) with BD and 12 healthy volunteers (12 eyes) as controls.

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