Abstract
Homonymous hemianopia is a visual defect caused by various pathological processes of the central nervous system, particularly if located beyond the optic chiasm. In the first part of this chapter, we describe the physiological principles of cortical visual processing. In the second part, we discuss the pathological physiology and etiopathogenesis of the disorders.
Causes of homonymous defects include cerebral stroke (primarily), as well as neurodegeneration, demyelinization, hypoxia, trauma, tumors, and carbon monoxide intoxication.
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Abbreviations
- 3D:
-
Three-dimensional, stereoscopic
- BA:
-
Brodmann area
- CNS:
-
Central nervous system
- CO:
-
Carbon monoxide
- Color vision:
-
Codes in applied color science: R, red; G, green; B, blue; M, magenta; Y, yellow; C, cyan; W, white; K, black
- Color Vision:
-
Cone types: LW, long wavelength, also red; MW, medium wavelength, also green; SW, short wavelength, also blue
- deg:
-
(angular) degrees, (o)
- FMRI:
-
Functional (nuclear) magnetic resonance imaging
- HH:
-
Homonymous hemianopia, sometimes also called hemianopsia
- LGN:
-
Lateral geniculate nucleus
- M, P:
-
Magnocellular, parvocellular
- rad:
-
Radians
- sq deg:
-
Square degrees, square degrees, deg2, (o)2
- sq rad:
-
Square radians, steradians, sr, rad2
- V1, V2, V3, V4, V5:
-
Primary (and secondary) visual areas
- V5:
-
is also denoted as MT, medio-temporal
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Acknowledgments
We thank both Craig Smith for copy editing and Veronika Sýkorová for drawing figures. This work is supported by the Graduate Students’ Research Program SVV 2016 no. 260 265 and by the Institutional Support for Long-term Development of Research Organizations (PRVOUK), no. P24/ LF1/ 3, at Charles University in Prague, the Czech Republic.
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Marsalek, P., Hajný, M., Vokurka, M. (2017). Pathological Physiology of the Visual Pathway. In: Skorkovská, K. (eds) Homonymous Visual Field Defects. Springer, Cham. https://doi.org/10.1007/978-3-319-52284-5_2
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DOI: https://doi.org/10.1007/978-3-319-52284-5_2
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