Visual Field Loss
Visual Field Loss - Related Videos
01:10
Line Loss
0 Views •
2024
The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss. Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
12:27
Piping Networks and Pressure Losses
0 Views •
2023
Source: Alexander S Rattner, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA This experiment introduces the measurement and modeling of pressure losses in piping networks and internal flow systems. In such systems, frictional flow resistance from channel walls, fittings, and obstructions causes mechanical energy in the form of fluid pressure to be converted to heat. Engineering analyses are needed to size flow hardware to ensure...
01:18
Reducing Line Loss
0 Views •
2024
In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this. With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
11:12
Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
0 Views •
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
0 Views •
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
The affected location helps explain how visual information is disrupted. Damage to the retina can interfere with detecting signals, whereas injury involving the optic nerve or brain visual pathways can interrupt transmission or interpretation. Examining this anatomical sequence helps clinicians connect a measured field pattern with the level at which processing is impaired.
The deficit may involve one eye or both, depending on which visual structures are affected. Because visual signals pass through the retina, optic nerve, and brain pathways, assessment of each eye helps show whether the change is limited to one side or involves a broader part of the visual system.
Characteristic patterns provide more information than the presence of reduced vision alone. Their distribution across the measured field can help clinicians relate the deficit to retinal, optic nerve, or brain pathway disruption. This pattern-based interpretation supports evaluation of glaucoma, retinal disease, stroke, and other neurological disorders.
Perimetry maps sensitivity across the visual field, allowing clinicians to identify areas where visual signals are reduced. The resulting map records the spatial pattern of the deficit rather than relying only on a general description of vision. That information can reveal characteristic changes and support clinical assessment.
Visual field testing gives clinicians a structured way to document the location and extent of a deficit. Interpreting the results can support diagnosis, while using the measurements for monitoring helps assess changes over time. The findings also contribute to decisions about evaluating or treating the underlying condition.
Assessment can contribute to the evaluation of glaucoma, retinal disease, stroke, and other neurological disorders. These conditions may disrupt different parts of the visual system, so the pattern shown by perimetry can provide clinically relevant context. The results support, rather than replace, broader diagnostic and treatment evaluation.