scholarly journals Increased Short-Term Fluctuation in Optic Nerve Head Blood Flow in a Case of Normal-Tension Glaucoma by the Use of Laser Speckle Flowgraphy

Vision ◽  
2016 ◽  
Vol 1 (1) ◽  
pp. 5
Author(s):  
Tetsuya Sugiyama ◽  
Hajime Nakamura
Keyword(s):  
Blood Flow ◽  
Optic Nerve ◽  
Optic Nerve Head ◽  
Normal Tension Glaucoma ◽  
Laser Speckle ◽  
Laser Speckle Flowgraphy ◽  
Short Term ◽  
Term Fluctuation

Association Between Optic Nerve Head Blood Flow Measured Using Laser Speckle Flowgraphy and Radial Arterial Pressure During Aortic Arch Surgery

2018 ◽  
Vol 32 (2) ◽  
pp. 702-708 ◽  
Author(s):  
Hironobu Hayashi ◽  
Masahiro Okamoto ◽  
Hideaki Kawanishi ◽  
Nobuoki Tabayashi ◽  
Toyoaki Matsuura ◽  
...  
Keyword(s):  
Blood Flow ◽  
Optic Nerve ◽  
Arterial Pressure ◽  
Aortic Arch ◽  
Optic Nerve Head ◽  
Laser Speckle ◽  
Laser Speckle Flowgraphy ◽  
Aortic Arch Surgery

scholarly journals Laser speckle flowgraphy derived characteristics of optic nerve head perfusion in normal tension glaucoma and healthy individuals: a Pilot study

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Anna Sophie Mursch-Edlmayr ◽  
Nikolaus Luft ◽  
Dominika Podkowinski ◽  
Michael Ring ◽  
Leopold Schmetterer ◽  
...  
Keyword(s):  
Pilot Study ◽  
Optic Nerve ◽  
Optic Nerve Head ◽  
Normal Tension Glaucoma ◽  
Laser Speckle ◽  
Laser Speckle Flowgraphy ◽  
Healthy Individuals

Non-invasive measurement techniques for quantitative assessment of optic nerve head blood flow

2019 ◽  
Vol 30 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Fia Vosborg ◽  
Lasse Malmqvist ◽  
Steffen Hamann
Keyword(s):  
Blood Flow ◽  
Optic Nerve ◽  
Optic Nerve Head ◽  
Optical Coherence Tomography Angiography ◽  
Laser Speckle ◽  
Doppler Imaging ◽  
Laser Speckle Flowgraphy ◽  
Colour Doppler ◽  
Non Invasive ◽  
Colour Doppler Imaging

Diseases of the optic nerve head involving changes in blood flow are common. However, the pathophysiology is not always fully understood. Several non-invasive methods for measuring optic nerve head blood flow are available, but currently no gold standard has been established. Methods for measuring blood flow in optic neuropathies including colour Doppler imaging, retinal function imager, optical coherence tomography angiography and laser speckle flowgraphy are reviewed. Ultrasound colour Doppler imaging is a fast measurement technique where several different parameters, especially the blood flow velocity, can be calculated. Though used for many years in ophthalmology, its use is not standardized and it requires significant observer skills. The retinal function imager is a direct method where the haemoglobin in erythrocytes is visualized and blood flow velocities in retinal vessels are calculated from a series of photos. The technique is not suitable for direct measurement of blood flow within the optic nerve head. Laser speckle flowgraphy uses a laser light which creates a light scatter pattern in the tissue. Particles moving in the area causes changes in the speckle pattern from which a relative blood flow can be estimated. It is, however, not known whether optic nerve head microcirculation is measurable with the technique. Optical coherence tomography angiography uses multiple scans to evaluate blood flow with good reproducibility but often problems with artefacts. The technique is continuously being refined and increasingly used in research as a tool for the study of blood flow in retinopathies and optic neuropathies. Most of the conducted studies are based on small sample sizes, but some of the methods show promising results in an optic nerve head blood flow research setting. Further and larger studies are required to provide standardized and comparable measurements before one or more of the methods can be considered clinical helpful in daily practice.

Assessment of Short-Term Changes in Optic Nerve Head Hemodynamics in Hyperoxic Conditions with Laser Speckle Flowgraphy

2014 ◽  
Vol 40 (10) ◽  
pp. 1055-1062 ◽  
Author(s):  
Yukihiro Shiga ◽  
Marika Sato ◽  
Kazuichi Maruyama ◽  
Shin Takayama ◽  
Kazuko Omodaka ◽  
...  
Keyword(s):  
Optic Nerve ◽  
Optic Nerve Head ◽  
Laser Speckle ◽  
Laser Speckle Flowgraphy ◽  
Short Term
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