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Learn about the anatomy, physiology and functions of the visual system, the sensory organ of vision. The article covers the optical, neural and cortical components of the system, as well as the visual pathways and processes involved in vision.
Learn how the eye captures and processes light to create visual perception. Explore the anatomy, physiology, and cell types of the retina, the light-sensitive region in the back of the eye.
1 sty 2015 · This chapter is an overview of the human visual system and some aspects of perception. We started of the structural and functional description of every stage of the visual pathway starting from the optics of the eye to the visual cortex.
The human visual system comprises three main parts: the eye, the lateral geniculate nucleus (LGN) and the part of the cortex brain that processes the visual information – the visual cortex. Fig. 2.1 shows a schematic structure of the visual pathway.
It will be demonstrated in later chapters that these properties are used extensively for image and video compression, and for designing display systems. In this chapter, we present the properties of the human visual system and visual perceptions.
The visual system is probably the most-used and most important of the human sensory systems. Some authorities estimate that about 40% of the human CNS is devoted to receiving and processing visual information. The eye is the sensory end-organ responsible for receiving visual information.
Pathway to Brain. Visual information from each eye leaves the retina via the ganglion cell axons at the optic disc, creating the optic nerve. The optic nerve, or cranial nerve II, exits the posterior end of the eyeball, and travels posteriorly along the ventral surface of the brain.
