B Wave Amplitude
B Wave Amplitude - Related Videos
09:32
Standing Waves
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Standing waves, or stationary waves, are waves that appear not to propagate and are produced by the interference of two waves traveling in opposite directions with the same frequency and amplitude. These waves appear to vibrate up and down with no linear movement and are most easily identified in vibrating finite media like a plucked guitar string,...
02:12
The Wave Nature of Light
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2020
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. Others in the...
01:17
Pulse amplitude and quality
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2024
Pulse amplitude is a crucial indicator of cardiac health because it provides valuable insights into the strength of left ventricular contractions and the overall uniformity of blood circulation within the vasculature. The strength of the pulse is directly related to the force with which the heart contracts and the volume of blood being pumped. A weak or absent pulse may indicate reduced cardiac output or poor left ventricular contraction, which can be signs of cardiovascular dysfunction or...
09:12
Sound Waves and Doppler Shift
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Waves are disturbances that propagate through a material medium or empty space. Light waves can travel through a vacuum and some forms of matter, and are transverse in nature, which means that the oscillations are perpendicular to the direction of propagation. However, sound waves are pressure waves that travel through an elastic medium like air,...
10:25
Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Cited by 39 •
2016
We present a method for achieving sub-nanometer resolution images with amplitude-modulation (tapping mode) atomic force microscopy in liquid. The method is demonstrated on commercial atomic force microscopes. We explain the rationale behind our choices of parameters and suggest strategies for resolution optimization.
FAQs
The recorded signal is shaped mainly by light-evoked activity in retinal ON-bipolar cells and Müller glia. These cells generate currents that contribute to the positive field potential detected at the cornea after stimulation. Consequently, a reduced measurement can indicate impaired function in inner-retinal pathways rather than simply reflecting a change in the photoreceptor response.
B-wave amplitude changes with both the strength of the light stimulus and the retina’s adaptation state. These variables alter the light-evoked response before it reaches the recording electrode, so measurements made under different conditions may not be directly comparable. Standardizing stimulus and adaptation conditions is therefore essential when assessing changes over time or between individuals.
Recording conditions can affect the size of the field potential obtained at the cornea, independently of the underlying retinal disorder. A small value should therefore be interpreted in relation to the protocol used, including stimulus and adaptation conditions. Consistent recording conditions improve the reliability of comparisons and help distinguish biological change from measurement-related variation.
Evaluation begins by exposing the retina to a defined light stimulus and recording the resulting ERG at the cornea. The positive response is then quantified as an amplitude, with the measurement interpreted under the relevant adaptation and recording conditions. Using a standardized ERG protocol allows the result to be compared across examinations, participants, or experimental groups.
Standardized comparisons make it possible to identify consistently reduced responses and to follow their behavior across repeated examinations. This supports assessment of inner-retinal dysfunction while limiting the influence of differing stimulus or recording conditions. In clinical and research settings, such comparisons can contribute to diagnosis, disease monitoring, and evaluation of retinal therapies.
Reduced amplitude may accompany retinal dystrophies, ischemia, or toxic injury, reflecting compromised inner-retinal function in those settings. The measurement is not used in isolation from the ERG protocol and clinical context. Instead, clinicians and researchers use standardized results to help characterize retinal disease, monitor progression or response, and assess effects of treatment.