Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 142 for “"Visual Field"”.
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Improving visual field tests for populations with advanced glaucoma and visual field loss in the periphery
The visual field can extend up to 100° in the temporal visual region; however, in patients with glaucoma and other diseases that affect peripheral vision, only the central 30° of the visual field is monitored regularly in clinical practice using static perimetry. These static tests are rapid and …
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Age-related similarities in the attentional visual field
The visual world is cluttered, and adaptive behavior often demands attention to multiple objects. Unfortunately, compared with young adults, older adults seem to show more difficulty in dividing attention across the visual field (e.g. Ball et al., 1988), an effect often interpreted as an …
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Studies on real world visual field data in glaucoma
… condition, it is important to monitor how the visual field (VF) changes over time with perimetry in preventing vision from deteriorating to a stage where quality of life is affected. However, there is little evidence of how clinical measurements correlate with meaningful quality of life …
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Attention to Non-Contiguous Locations of the Visual Field
… attention over noncontiguous locations of the visual fields, but may not be able to maintain the multiple foci if stimulus-based attention capture by sudden-onsets disrupt previous built attentional foci. The series of current experiments further provided the converging evidence that people …
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Visual field and structural alterations in age-related macular degeneration
… investigated progression of the central 10° visual field with structural changes at the macula in a cross-section of patients with varying degrees of agerelated macular degeneration (AMD). The relationships between structure and function were investigated for both standard and …
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Study of visual field defects in patients with epilepsy receiving Vigabatrin
… partial epilepsy and has been associated with visual field defects. Uncertainity in the effect of Vigabatrin on vision resulted in decreased prescriptions. However, there has been poor reproducibility in previous studies due to many factors, especially poor sensitivity and specificity of tests …
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Eye movements, search and perception of visual field defects in glaucoma
… nerve that can result in irreversible loss of visual function and impairment in everyday visual tasks. The experimental studies described in this thesis primarily aim to investigate the performance of people with glaucoma on search and other visual tasks whilst simultaneously monitoring eye …
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Influence of the visual field on manual roll and lateral stabilization
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Compatibility in the visual field and the use of nontraditional flight displays
Two visual-spatial tasks were time-shared in an experiment to investigate the possibility of a compatibility mapping between the type of task (object-identification or motion-judgment) and the presentation location of the task in the visual field (central or peripheral). The attentional costs …
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Masking in Central Visual Field Under a Variety of Temporal and Spatial Configurations
For over a century, visual maskingwhere one stimulus reduces the visibility of another stimulushas been used as a powerful tool to explore the visual system. Two major forms have emerged: backward masking and common onset masking. These two forms, which are characterized by the temporal properties …
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The multifocal visual evoked cortical potential in visual field mapping: a methodological study.
The application of multifocal techniques to the visual evoked cortical potential permits objective electrophysiological mapping of the visual field. The multifocal visual evoked cortical potential (mfVECP) presents several technical challenges. Signals are small, are influenced by a number of …
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Equating discriminability of subjective contours across the visual field requires two scaling factors
Performance in visual tasks can often be equated across eccentricities by proper scaling. The scaling or inverse magnification function (EMF), describes the ratio of peripheral to foveal stimulus size required to equate performance. Tasks and visual brain regions have different IMFs. It is argued …
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A novel instrument to measure visual field loss in glaucoma patients using pupil perimetrty
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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On the insufficiency of laterality-based accounts of face perception and corresponding visual field asymmetries
… for face recognition and a contralateral hemifield-hemisphere correspondence between the RH and the left visual field (LVF). The purpose of this set of experiments was to determine whether RH superiority for faces and contralateral hemifield-hemisphere correspondence is sufficient to explain …
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Reclaiming the periphery: Kinetic perimetry in patients with glaucoma
… of the central 30˚ is the most often used visual field test in glaucoma patients. Short test durations are achieved by focusing on a central region, which constitutes ~20% of the visual field. However, ignoring the periphery may sacrifice information on how patients are affected …
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Factors which determine visual acuity
… and subcortical projection of the rabbits' visual field, with particular emphasis on the magnification that certain regions of the visual field undergo in the process.
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The role of peripheral visual cues in planning and controlling movement :|ban investigation of which cues provided by different parts of the visual field influence the execution of movement and how they work to control upper and lower limb motion.
Visual cues have previously been classified as visual exproprioceptive, when defining the relative position of the body within the environment and are continuously updated while moving (online), and visual exteroceptive when describing static features of the environment which are typically …
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THE LATERALIZATION OF THE WORD FREQUENCY EFFECT
… The first was a small-n experiment varying visual angle of presentation, signal to noise ratios, visual field and word class (noun/verb) while using high frequency word and nonword items. The purpose of this experiment was to document the sensitivity of observers to material presented …
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