Results 241 to 250 of about 924,003 (290)

Computed Tomography of the Visual Pathways

International Ophthalmology Clinics, 1979
Many articles have discussed the anatomy and pathology of the orbits. Although this area is exquisitely visualized via computed tomography, the bulk of the visual apparatus lies behind the optic canal. A variety of pathologic conditions will manifest themselves by changes in the visual fields.
C M, Citrin, M G, Alper
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Visual pathways

2012
Visual disturbances may be caused by diseases of the optic disc, optic nerve, optic chiasm, optic tract, lateral geniculate nucleus, optic radiations, and occipital lobe of the brain, as well as other brain areas involved in complex visual processing.Diagnosis of disturbances of the visual pathways requires both knowledge of their anatomy and ...
Christopher Kennard, Sara Ajina
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The complexity of the visual cells and visual pathways of the sturgeon

Microscopy Research and Technique, 2004
AbstractThe visual cells in the retinae of the sturgeon were studied by scanning electron microscopy and transmission electron microscopy. Our investigations revealed the presence of rods, two types of single cones, one type of double cone (two nonidentical cone components adhered together), and one type of twin cone (two identical cone components ...
Marong, Fang, Jicheng, Li, W H, Kwong, P, Kindler, Gang, Lu, Sen Mun, Wai, David T, Yew   +6 more
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Intracranial pathology of the visual pathway

European Journal of Radiology, 2004
Intracranial pathologies involving the visual pathway are manifold. Aligning to anatomy, the most frequent and/or most important extrinsic and intrinsic intracranial lesions are presented. Clinical symptoms and imaging characteristics of lesions of the sellar region are demonstrated in different imaging modalities.
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Visual Attention And the Parallel Visual Pathways

2002
Before examining the differential role played by the two major parallel visual pathways in attention I should like to very briefly review the current status of the parvo-magno functional segregation at various levels of the visual pathways, mainly referring to primates.
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Adaptive encoding in the visual pathway

Network: Computation in Neural Systems, 2003
In a natural setting, the mean luminance and contrast of the light within a visual neuron's receptive field are constantly changing as the eyes saccade across complex scenes. Adaptive mechanisms modulate filtering properties of the early visual pathway in response to these variations, allowing the system to maintain differential sensitivity to ...
Nicholas A, Lesica, Alireza S, Boloori, Garrett B, Stanley   +2 more
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Visual Pathways

2009
Abstract In This Chapter, we will draw the most overtly relied upon sensory system—the visual sensory system, and in the next chapter, we will learn the eye movements. Let’s begin with an axial section through the eyeball and include the posterior optic nerve attachment.
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Advances in Neuroimaging of the Visual Pathways

American Journal of Ophthalmology, 1996
To provide a practical review for the ophthalmologist of advances in neuroimaging of the visual pathways.We reviewed recent advances in computed tomography, magnetic resonance imaging, and angiography that are applicable to visual pathways imaging.For detailed ocular imaging, computed tomography complements ocular sonography for imaging of ...
P C, Davis, N J, Newman
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An underestimated visual pathway in reptiles

Neuroscience Letters, 1985
Field potentials evoked in the turtle general cortex by electric stimulation of the optic tectum were analyzed. Cathodal polarization and subtotal lesions of n. rotundus led to either facilitation or depression of later components of the cortical potential. On the contrary, cathodal polarization and lesions of n.geniculatus lateralis dorsalis similarly
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Hyperacuity and interpolation by the visual pathways

Vision Research, 1982
Abstract Hyperacuity demands some form of neural interpolation. This places constraints on the relation between optical image quality and the cone mosaic. In particular, if the cone mosaic significantly undersamples the optical image, then hyperacuity is downgraded.
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