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Visual system information

Visual system
The visual system includes the eyes, the connecting pathways through to the visual cortex and other parts of the brain (human system shown).
The eye is the sensory organ of the visual system. The iris, pupil, and sclera are visible
Anatomical terminology
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The visual system is the physiological basis of visual perception (the ability to detect and process light). The system detects, transduces and interprets information concerning light within the visible range to construct an image and build a mental model of the surrounding environment. The visual system is associated with the eye and functionally divided into the optical system (including cornea and lens) and the neural system (including the retina and visual cortex).

The visual system performs a number of complex tasks based on the image forming functionality of the eye, including the formation of monocular images, the neural mechanisms underlying stereopsis and assessment of distances to (depth perception) and between objects, motion perception, pattern recognition, accurate motor coordination under visual guidance, and colour vision. Together, these facilitate higher order tasks, such as object identification. The neuropsychological side of visual information processing is known as visual perception, an abnormality of which is called visual impairment, and a complete absence of which is called blindness. The visual system also has several non-image forming visual functions, independent of visual perception, including the pupillary light reflex and circadian photoentrainment.

This article describes the human visual system, which is representative of mammalian vision, and to a lesser extent the vertebrate visual system.

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Visual system

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Visual perception

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Visual cortex

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The visual cortex of the brain is the area of the cerebral cortex that processes visual information. It is located in the occipital lobe. Sensory input...

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the overall quality of visual function. Visual acuity is a measure of the spatial resolution of the visual processing system. VA, as it is sometimes...

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Visual phototransduction

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Visual phototransduction is the sensory transduction process of the visual system by which light is detected by photoreceptor cells (rods and cones in...

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Visual impairment

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Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception. For the former and latter case, the terms low vision and...

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Visual pathway lesions

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pathway cause a variety of visual field defects. In the visual system of human eye, the visual information processed by retinal photoreceptor cells travel...

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a respective visual system (sense of vision), auditory system (sense of hearing), somatosensory system (sense of touch), olfactory system (sense of smell)...

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understood, the principle of the system appears to be simple. It has a similar set of sensitivities to the human visual system, but works in the opposite manner...

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of visual systems in jellyfish. Jellyfish visual systems range from simple photoreceptive cells to complex image-forming eyes. More ancestral visual systems...

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Visual agnosia is an impairment in recognition of visually presented objects. It is not due to a deficit in vision (acuity, visual field, and scanning)...

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Optical illusion

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In visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept...

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Receptive field

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have been identified for neurons of the auditory system, the somatosensory system, and the visual system. The term receptive field was first used by Sherrington...

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Photoreceptor cell

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cells are rods and cones, each contributing information used by the visual system to form an image of the environment, sight. Rods primarily mediate scotopic...

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Receptive fields have been identified for the visual system, auditory system and somatosensory system. While debate exists among neurologists as to the...

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Visual hierarchy, according to Gestalt psychology, is a pattern in the visual field wherein some elements tend to "stand out," or attract attention, more...

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facts are known regarding the visual system of the leptocephali. The first is that they have a rod-dominated visual system. The second is that the Synaphobranchidae...

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perception, and object recognition. Unlike many other sensory systems, the human visual system – components from the eye to neural circuits – develops largely...

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The visual field is "that portion of space in which objects are visible at the same moment during steady fixation of the gaze in one direction"; in ophthalmology...

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Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decrypted...

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somatosensory system, to result in a perceived environment that is not congruent with the actual stimuli. Through this phenomenon, the visual system is able...

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