Visual Field Stability
Visual Field Stability - Related Videos
03:18
Nuclear Stability
0 Views •
2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
05:36
Central and Divided Visual Field Presentation of Emotional Images to Measure Hemispheric Differences in Motivated Attention
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2017
This study compared central versus divided visual field presentations of emotional images to assess differences in motivated attention between the two hemispheres. The late positive potential (LPP) was recorded using electroencephalography (EEG) and event-related potentials (ERPs) methodologies to assess motivated attention.
11:12
Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
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Cited by 20 •
2012
Patients with visual deficits after stroke report about different constraints in daily life most likely due to variable compensatory strategies, which are difficult to differentiate in clinical routine. We present a clinical set-up which allows measurement of different compensatory head- and eye-movement-strategies and evaluating their effects on driving performance.
06:02
Topographical Estimation of Visual Population Receptive Fields by fMRI
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Cited by 3 •
2015
It is important to obtain unbiased estimates of visual population receptive fields (pRFs) by functional magnetic resonance imaging. We use mild regularization constraints to estimate pRF topography without a-priori assumptions about pRF shape, allowing us to choose specific pRF models post-hoc. This is particularly advantageous in subjects with visual-pathway lesions.
FAQs
During rapid saccadic eye movements, saccadic suppression reduces the visual impact of image changes. This limits awareness of motion-related disruption while the eyes shift gaze. The brain then combines information from successive visual images, helping preserve continuity across those shifts. This mechanism is important when interpreting whether an apparent field change reflects physiology or unstable sensory sampling.
The vestibulo-ocular reflex helps coordinate eye position with vestibular signals during head or body movement. By contributing to gaze control, it supports a stable visual representation even when viewing direction changes. Its role complements retinal and cortical processing, because visual field stability depends on coordinated ocular-motor, vestibular, and neural mechanisms rather than retinal input alone.
Neural integration combines information from successive visual images instead of treating every momentary input as an isolated representation. This processing helps the visual system maintain continuity when sensory signals vary or when gaze changes. In clinical interpretation, understanding this integration helps distinguish a meaningful alteration in the visual field from a temporary effect of changing visual input.
Repeated perimetry allows clinicians to compare visual field measurements obtained at different examinations. Consistent findings provide stronger support that an observed pattern reflects the patient's visual function, whereas inconsistent results may indicate measurement artifacts or unstable testing conditions. This repeated assessment can also help monitor changes over time in disorders affecting the visual field.
Fixation monitoring helps clinicians judge whether the patient's gaze remained appropriately controlled during visual field examination. Poor or inconsistent fixation can make a result less reliable and may create an apparent field abnormality that does not represent true visual dysfunction. Used alongside repeated perimetry and related examinations, it supports more careful separation of genuine findings from artifacts.
Changes in visual field stability may assist assessment of glaucoma, retinal disease, optic nerve injury, and neurological disorders. Clinicians can use these findings with repeated perimetry, fixation monitoring, and related examinations to support diagnosis and treatment planning. Serial evaluation also provides information relevant to monitoring disease progression, although interpretation depends on measurement reliability and clinical context.