Chiharu Iwahashi

Dr. Chiharu Iwahashi

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Research Focus & Metrics

Academic Career Length

12Years (2015-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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10 February 2015 in Graefe's Archive for Clinical and Experimental Ophthalmology
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KTKotaro Tsuboi
Kotaro Tsuboi
KNKei Nakai
Kei Nakai
CIChiharu Iwahashi
Chiharu Iwahashi
FGFumi Gomi
Fumi Gomi
YIYasushi Ikuno
Yasushi Ikuno
KNKohji Nishida
Kohji Nishida

3 August 2020 in BMC Infectious Diseases
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CIChiharu Iwahashi
Chiharu Iwahashi
HEHiroshi Eguchi
Hiroshi Eguchi
FHFumika Hotta
Fumika Hotta
MUMayu Uezumi
Mayu Uezumi
MSMiki Sawa
Miki Sawa
SKShunji Kusaka
Shunji Kusaka
Background: Subtenon injection of triamcinolone acetonide (STTA) has been widely adopted in the clinical setting of ophthalmology and its infectious complications are rare. However, orbital abscess following STTA has been reported in seven cases. Furthermore, although eye infections due to Exophiala species are uncommon, there have been 19 cases to date. E. jeanselmei, E. phaeomuriformis, E. werneckii, and E. dermatitidis have been reported to cause human eye infections; however, to the best of our knowledge, orbital abscess caused by E. dermatitidis has not yet been reported. We describe the first documented case of fungal orbital abscess caused by E. dermatitidis following STTA. We also review the related literature of orbital abscess following STTA, as well as eye infections caused by the four Exophiala species. Case presentation: The patient was a 69-year-old Japanese woman with diabetic mellitus. She had a macular oedema in her right eye, which occurred secondary to branch retinal vein occlusion. An orbital abscess caused by E. dermatitidis occurred 4 months after the second STTA for the macular oedema, which was successfully treated by a surgical debridement and systemic administration of voriconazole. Conclusions: Our findings in the patient and from our literature survey caution ophthalmologists to the fact that STTA can cause fungal orbital infections, especially in diabetic patients. Furthermore, surgical treatment is one of the most important risk factors.

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CIChiharu Iwahashi
Chiharu Iwahashi
TKTomoki Kurihara
Tomoki Kurihara
KKKazuki Kuniyoshi
Kazuki Kuniyoshi
SKShunji Kusaka
Shunji Kusaka
This study evaluated the long-term visual outcomes of patients in whom at least one eye underwent successful lens-sparing vitrectomy (LSV) for stage 4A retinopathy of prematurity (ROP). A retrospective chart review was conducted using the data of 61 eyes of 42 patients with a minimum 4-year follow-up after successful LSV, with or without anti-vascular endothelial growth factor (VEGF) therapy, and whose best-corrected visual acuity (BCVA) was measurable using Landolt rings at the final visit. The mean age at the final follow-up was 10.1 ± 3.3 years. Before LSV, all eyes underwent laser ablation therapy. Twenty eyes (32.8%) with high vascular activity received anti-VEGF therapy before LSV. The mean decimal BCVA at the final follow-up was 0.23 ± 0.26 (range: hand motion to 1.2). Twenty-three eyes (54.1%) had a decimal BCVA of ≥0.4. Among 49 phakic eyes at the final examination, the mean refractive error was −10.1 ± 5.0 D, with 37 eyes (75.5%) having high myopia (>−6.0 D). No significant differences were observed in terms of decimal BCVA and refractive errors between eyes with and without anti-VEGF therapy. Approximately half of the patients had a decimal BCVA of ≥0.4, despite myopic refraction after successful LSV for stage 4A ROP. LSV for stage 4A ROP seemed to be associated with good visual function, despite myopic refraction.

1 November 2021 in Ophthalmology Retina
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CIChiharu Iwahashi
Chiharu Iwahashi
KTKuniko Tachibana
Kuniko Tachibana
TOTomoyuki Oga
Tomoyuki Oga
CKChiori Kondo
Chiori Kondo
KKKazuki Kuniyoshi
Kazuki Kuniyoshi
SKShunji Kusaka
Shunji Kusaka
To determine the incidence and factors associated with lens opacity after lens-sparing vitrectomy (LSV) for retinopathy of prematurity (ROP). Retrospective, comparative case series. Among the 141 eyes of 94 patients who underwent LSV for ROP between 2006 and 2019, 108 eyes of 71 patients with a minimum follow-up of 12 months after LSV were investigated. Data were collected from patients' charts, including gender, gestational age at birth, birth weight, stage of ROP, postmenstrual age (PMA) at LSV, surgical procedure, preoperative injection of anti-vascular endothelial growth factor (VEGF) agents, subsequent retinal surgeries, and lensectomy during follow-up. Lens status at last visit, incidence and timing of lensectomy, and risk factors for lens opacity requiring lensectomy. Stages of ROP at LSV were 4A, 4B, and 5 in 92 eyes, 13 eyes, and 3 eyes, respectively. The median PMA at LSV was 40.6 weeks. Thirty-two eyes received anti-VEGF therapy before LSV. Lens opacity was found in 17 eyes (15.7%), of which 10 eyes (9.3%) underwent lensectomy. The period between LSV and lensectomy ranged from 21 days to 131.9 months (median, 21.1 months). Eleven other eyes (10.2%) underwent lensectomy as part of a reoperation for worsening of ROP. A total of 80 eyes (74.1%) preserved clear lenses at the latest follow-up examination after surgery (median, 6.8 years; range, 1-14 years). The Kaplan-Meier estimate showed that the proportion of patients with phakia at 5 and 10 years was 92.4% and 89.0%, respectively. Multivariate Cox regression analysis revealed that eyes with the use of tamponade at LSV (P = 0.005; odds ratio [OR], 25.68; 95% confidence interval [CI], 4.187-157.5) and young PMA at LSV (P = 0.033; OR, 1.047; 95% CI, 1.012-1.099) were associated significantly with lens opacity requiring lensectomy. However, anti-VEGF therapy was not associated with lens opacity requiring lensectomy. Nearly 10% of eyes required lensectomy because of lens opacity after LSV for ROP. The development of lens opacity requiring lensectomy seems to be associated with the use of tamponade and young PMA at LSV.

25 February 2025 in Ophthalmology Retina
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TOTomoyuki Oga
Tomoyuki Oga
FMFukutaro Mano
Fukutaro Mano
KKKazuki Kuniyoshi
Kazuki Kuniyoshi
CIChiharu Iwahashi
Chiharu Iwahashi
HKHIROYUKI KONDO
HIROYUKI KONDO
SKShunji Kusaka
Shunji Kusaka
To investigate factors associated with the surgical outcomes of tractional retinal detachment (TRD) in eyes with familial exudative vitreoretinopathy (FEVR). Retrospective chart review. Patients who underwent surgeries for TRD associated with FEVR between April 2011 and April 2022 and who had follow-up of at least 18 months were included in the analysis. Vitrectomy was performed on 47 eyes, with scleral buckling in four eyes and simultaneous lensectomy in 26 eyes. Data including sex, age at the first surgery, disease stage, extent of fibrovascular proliferation (FVP, within 3 h or >3 h), preoperative fluorescein angiography (FA) grading (grade 1: mild leakage caused by FVP, grade 2: severe leakage), surgical outcomes, and complications were collected. The age at the initial surgery ranged from 1 month to 15 years (median: 6 months). Thirty-two eyes were from male patients and 15 eyes from female ones. Only one eye in 25 patients was affected. In 11 patients, bilateral eyes were involved. In total, 8 eyes presented with stage 3 FEVR, 31 with stage 4, and 8 with stage 5. Preoperative FA was performed on 38 of 47eyes. There were 26 eyes with FA grade 1 and 12 eyes with FA grade 2. The retina was reattached in 33 (70.2%) eyes at the final examination. Based on the univariate logistic regression analysis, a higher retinal reattachment (RA) rate was significantly associated with a lower FEVR stage (P = 0.0001), FA grade (P = 0.0008), and preoperative extent of FVP (P = 0.02). In the multivariate logistic regression analysis, only FA grade was significantly associated with RA (P = 0.04, odds ratio: 9.0, 95% confidence interval: 1.2-7.0 × 10). Eyes with TRD associated with FEVR in patients with mild FA leakage had a higher RA rate. Hence, the use of FA in evaluating disease activity can be useful in predicting surgical outcomes.

28 February 2019 in Case Reports in Ophthalmology
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MIMasahiro Ikeda
Masahiro Ikeda
CIChiharu Iwahashi
Chiharu Iwahashi
THTakashi Hirai
Takashi Hirai
KHKenji Hattori
Kenji Hattori
KMKeiichi Mitarai
Keiichi Mitarai
We report a case of eosinophilic chronic rhinosinusitis (ECRS) associated with choroidal folds and ocular motility disorder. A 50-year-old male with rhinosinusitis and bronchial asthma presented with anorthopia of the lower visual field and ocular motility disorder of the left eye. Dilated fundus examination and optical coherence tomography (OCT) revealed wavy choroidal folds in the upper retina. An emergent computed tomography (CT) showed sinusitis, a partial defect of the superior wall of the orbit on the left side, and deformation of the left eye. Based on the clinical findings, the patient was diagnosed with sinusitis complicated by ocular motility disorder. Endoscopic sinus surgery (ESS) was performed. A histopathological examination of the excised polyps showed extensive eosinophil invasion. According to the clinical findings of the nasal polyps, CT images, and peripheral blood tests, he was diagnosed as ECRS. One month after ESS, both ocular movement and anorthopia were improved. The choroidal folds observed using OCT disappeared 2 months after ESS. Although ECRS is rarely associated with ocular complications, bone involvement in sinusitis may result in deformation of the eyeball leading to choroidal folds and ocular motility disorder.