Article
Public, Environmental & Occupational Health
Takashi Itokawa, Tadashi Matsumoto, Saiko Matsumura, Momoko Kawakami, Yuichi Hori
Summary: The purpose of this study was to determine the differences and reproducibility of blood flow in hyperopic anisometropic eyes compared to fellow eyes and control eyes. The study found that the optic nerve head, mean blur rate, tissue mean blur rate, and area ratio of blood stream were significantly higher in hyperopic anisometropic eyes compared to fellow and control eyes, while the sample size was smaller. The conclusion was that the MBR values of the optic nerve head exhibited reproducibility and could be used to detect hyperopic anisometropic eyes.
FRONTIERS IN PUBLIC HEALTH
(2023)
Article
Multidisciplinary Sciences
Jan Odstrcilik, Radim Kolar, Folkert Horn, Ralf-Peter Tornow
Summary: The paper presents a comparative study on pulsatile attenuation amplitude (PAA) within the optic nerve head (ONH) and its relevance to retinal nerve fiber layer thickness (RNFL) changes in glaucoma patients. The proposed methodology utilizes retinal video sequences acquired by a novel video ophthalmoscope. Correlation analysis between PAA and RNFL shows significant correlation in different evaluating patterns. The paper also demonstrates the potential use of the proposed photoplethysmographic principle to analyze retinal perfusion changes and assess RNFL deterioration progression.
Article
Ophthalmology
Andrew Turpin, Allison M. McKendrick
Summary: The study investigated ocular and systemic factors related to glaucoma in normal Japanese individuals using laser speckle flowgraphy. Results showed that interindividual comparison of ocular blood flow measurements must consider systemic factors such as blood pressure and age, as well as local ocular factors like axial length and disc or cup areas.
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2021)
Article
Ophthalmology
Michelle R. Tamplin, Kimberly A. Broadhurst, Anthony H. Vitale, Ryuya Hashimoto, Randy H. Kardon, Isabella M. Grumbach
Summary: Alterations in neurovascular coupling have been associated with various ocular, cerebral, and systemic vascular disorders. A new method for quantifying light-flicker induced hyperemia in mouse retina was presented using laser speckle flowgraphy (LSFG). This method showed low variability over multiple imaging sessions, indicating its potential application in serial studies of neurovascular coupling.
EXPERIMENTAL EYE RESEARCH
(2022)
Article
Biochemical Research Methods
Yiming Lu, Ruikang K. Wang
Summary: By using Eigen-decomposition and spatial filtering methods, this study successfully separated the effects of ocular optical changes on LSFG, significantly improving the detection of blood vessel integrity and correcting distortions in pulse waveforms.
JOURNAL OF BIOPHOTONICS
(2022)
Article
Anesthesiology
Yasushi Motoyama, Hironobu Hayashi, Hideaki Kawanishi, Kohsuke Tsubaki, Tsunenori Takatani, Yoshiaki Takamura, Masashi Kotsugi, Taekyun Kim, Shuichi Yamada, Ichiro Nakagawa, Young-Su Park, Masahiko Kawaguchi, Hiroyuki Nakase
Summary: LSFG can measure ocular blood flow velocity to detect ischemic stress during CEA. The MBR reduction ratio is positively correlated with the rSO(2) index, suggesting LSFG could be used to evaluate cerebral ischemic tolerance during CEA.
JOURNAL OF CLINICAL MONITORING AND COMPUTING
(2021)
Article
Multidisciplinary Sciences
Ayako Oi, Hironobu Hayashi, Yasushi Motoyama, Hideaki Kawanishi, Ichiro Nakagawa, Hiroyuki Nakase, Masahiko Kawaguchi
Summary: We report two cases where laser speckle flowgraphy (LSFG) was successfully used to measure ocular blood flow for assessing changes in cerebral perfusion after carotid endarterectomy (CEA). Postoperatively, an increase of 18.7% (case 1) and 47.7% (case 2) in ocular blood flow was measured using LSFG compared to baseline. LSFG may be a useful tool for evaluating cerebral perfusion after CEA.
Article
Ophthalmology
Michelle R. Tamplin, Kimberly A. Broadhurst, Anthony H. Vitale, Ryuya Hashimoto, Randy H. Kardon, Isabella M. Grumbach
Summary: The study investigated the use of LSFG for blood flow analysis in mice during and after angiotensin-II infusion, finding that hypertension induced by angiotensin-II leads to reduced blood flow, increased vascular resistance, and decreased blood flow area in retinal vessels. These effects reversed post-infusion for 2 weeks, but persisted up to 6 weeks post-infusion in mice administered with angiotensin-II for 4 weeks. The study highlights the potential utility of retinal LSFG for translational studies on hypertension-induced microvascular effects.
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2021)
Article
Biology
Takeshi Iwase, Yoshitaka Ueno, Ryo Tomita, Hiroko Terasaki
Summary: This study investigated the effect of renal dysfunction categorized by CKD stage on retinal microcirculation and artery caliber in diabetic patients. The results showed that diabetic patients with stage 3 CKD had significantly lower MBR and TRFI compared to those without CKD. Multiple regression analysis also demonstrated an independent association between CKD stage and MBR/TRFI. However, there were no significant differences in arterial diameter among the groups.
Review
Ophthalmology
Chao Gu, Ailing Li, Ling Yu
Summary: By analyzing 15 studies, it was found that LSFG has the potential feasibility for diagnosing glaucoma, by showing the mean blur rate (MBR) in the optic nerve head and demonstrating significant differences in MBR among different glaucoma types.
INTERNATIONAL OPHTHALMOLOGY
(2021)
Article
Clinical Neurology
Shinsuke Yoshida, Soichi Oya, Hiroto Obata, Naoaki Fujisawa, Tsukasa Tsuchiya, Takumi Nakamura, Masahiro Indo, Masaaki Shojima, Toru Matsui
Summary: CEA may effectively improve visual dysfunction caused by chronic ocular ischemia due to carotid artery stenosis by increasing ocular blood flow, as shown in this prospective observational study.
ACTA NEUROCHIRURGICA
(2021)
Article
Multidisciplinary Sciences
Kazuyuki Hirooka, Kenji Oki, Keiko Ogawa-Ochiai, Yuta Nakaniida, Hiromitsu Onoe, Yoshiaki Kiuchi
Summary: This study aimed to compare the optic nerve head (ONH) blood flow in healthy eyes and eyes with primary aldosteronism (PA) using laser speckle flowgraphy (LSFG). The results showed that PA patients had significantly lower ONH blood flow than normal subjects, indicating a decrease in blood flow in PA eyes.
Article
Ophthalmology
Michelle R. Tamplin, Jui-Kai Wang, Anthony H. Vitale, Ryuya Hashimoto, Mona K. Garvin, Elaine M. Binkley, Daniel E. Hyer, John M. Buatti, H. Culver Boldt, Randy H. Kardon, Isabella M. Grumbach
Summary: In this study, reductions in retinal and choroidal blood flow were detected using laser speckle flowgraphy after I-125-plaque brachytherapy for uveal melanoma, suggesting that decreased blood flow may be an early indicator of microangiographic response to radiation therapy.
Article
Ophthalmology
Ahmed M. Abu El-Asrar, Waleed Alsarhani, Abdullah Alzubaidi, Priscilla W. Gikandi
Summary: This study investigated the effects of immunosuppressive therapy on blood flow and waveform parameters in VKH disease patients with initial-onset acute uveitis. The results showed significant improvements in blood flow parameters and reduced vascular resistance following immunosuppressive therapy.
ACTA OPHTHALMOLOGICA
(2021)
Article
Ophthalmology
Rachelle Koch, Brendan Seto, Keiko Yamada, Purva Atreay, Colin A. Lemire, Nina Hazra, Jorge G. Arroyo
Summary: This study quantified retinal vascular blood flow affected by unilateral central or branch retinal vein occlusion. A new metric, relative blood flow (RBF), was created to assess disease severity and predict future treatment needs for CRVO and BRVO patients.
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2021)