Visual system Visual system The choroid, also known as the choroidea or choroid coat, is the vascular layer of the eye lying between the retina and the sclera. The choroid provides oxygen and nourishment to the outer layers of the retina ** . ...more on Wikipedia about "Choroid"
The dorsal stream is a pathway for visual information which flows through the visual cortex, the part of the brain which provides visual processing. It is involved in spatial awareness: recognizing where objects are in space. The dorsal stream is one of two main pathways of the visual cortex, the other being the ventral stream. ...more on Wikipedia about "Dorsal stream"
An eye is an organ that detects light. Different kinds of light-sensitive organs are found in a variety of creatures. The simplest eyes do nothing but detect whether the surroundings are light or dark. More complex eyes are used to provide the sense of vision. Many complex organisms including some mammals, birds, reptiles and fish have two eyes which may be placed on the same plane to be interpreted as a single three-dimensional "image" ( binocular vision), as in humans; or on different planes producing two separate "images" ( monocular vision), such as in rabbits and chameleons. ...more on Wikipedia about "Eye"
A ganglion cell (sometimes called a gangliocyte) is a type of neuron located in the retina of the eye that receives visual information from photoreceptors via various intermediate cells such as bipolar cells, amacrine cells, and horizontal cells. Retinal ganglion cells’ axons are myelinated. The myelinated parts are outside the eye. These axons form the optic nerve and connect mainly to the lateral geniculate nucleus (LGN) in the brain. ...more on Wikipedia about "Ganglion cell"
The lateral geniculate nucleus (LGN) of the thalamus is a part of the brain, which is the primary processor of visual information, received from the retina, in the central nervous system. ...more on Wikipedia about "Lateral geniculate nucleus"
Magnocellular parts, also called M cells, are cells in the brain concerned primarily with visual perception. In particular these cells are responsible for resolving motion and coarse outlines. The cells have large, fast-conducting neurons and transmit information to the lateral geniculate nucleus, the area of the brain responsible for analyzing and interpreting the information. This system of cells operates with great speed at the expense of detail. ...more on Wikipedia about "Magnocellular part"
(Ocular manifestations of systemic disease) * Candida albicans ...more on Wikipedia about "Ocular manifestations of systemic disease" Tell your friends about www.shortopedia.com Visual_system
The optic chiasm (from the Greek χλαζειν 'to mark with an X', after the letter 'Χ' chi) is the part of the brain where the optic nerves partially cross, those parts of the right eye which see things on the right side being connected to the left side of the brain, and vice versa. ...more on Wikipedia about "Optic chiasm"
The optic nerve is the nerve that transmits visual information from the retina to the brain. ...more on Wikipedia about "Optic nerve"
Optic neuritis (or retrobulbar neuritis) is the inflammation of the optic nerve that may cause a complete or partial loss of vision. ...more on Wikipedia about "Optic neuritis"
The optic radiations consist of axons of relay neurons in the lateral geniculate nucleus (LGN) which run from the LGN to the visual cortex. ...more on Wikipedia about "Optic radiations"
The optic tract is a part of the visual system in the brain. ...more on Wikipedia about "Optic tract"
Parvocellular parts (also called P-cells), are slow-conducting neurons; transmitting information about colour vision, texture, pattern, and visual acuity. The cells transmit the information to the lateral geniculate nucleus, the area of the brain responsible for analyzing and interpreting the information. ...more on Wikipedia about "Parvocellular part"
A phosphene is an entoptic phenomenon characterized by the sensation of light from mechanical, electrical, or magnetic stimulation of the eye's retina, or from random firing of cells in the visual system, rather than from light. ...more on Wikipedia about "Phosphene"
Photosensitive ganglion cells, or melanopsin-containing ganglion cells, are a recently discovered type of cell in the retina of the eye which, unlike other retinal ganglion cells, are intrinsically photosensitive. They exhibit robust light responses even when all influences from classical photoreceptors ( rods and cones) are blocked, either by applying pharmacological agents or by dissociating the ganglion cell from the retina. Photosensitive ganglion cells contain the photopigment melanopsin. Giant retinal ganglion cells are examples of photosensitive ganglion cells. ...more on Wikipedia about "Photosensitive ganglion cell"
Pursuit movement is the ability of the eyes to follow a moving object around. This is somewhat less accurate than the vestibulo ocular reflex because it requires the brain to process incoming visual information and provide feedback. ...more on Wikipedia about "Pursuit movement"
The retina is a thin layer of cells at the back of the eyeball of vertebrates and some cephalopods; it is the part of the eye which converts light into nervous signals. ...more on Wikipedia about "Retina"
Saccadic masking, also known as saccadic suppression, is the phenomenon in visual perception where the mind selectivly blocks visual processing during eye movements in such a way that neither the motion of the eye (and subsequent motion blur of the image) nor the gap in visual perception is noticeable to the viewer. ...more on Wikipedia about "Saccadic masking"
Trichromatic color vision is the ability of humans and some other animals to see different colors, mediated by interactions among three types of color-sensing cone cells. Each of the three types of cone in the retina of the eye contains a different type of photosensitive pigment called retinal, which is composed of a transmembrane protein called opsin and a light-sensitive protein called 11-cis retinal. Each different pigment is especially sensitive to a certain wavelength of light (that is, the pigment is most likely to produce a cellular response when it is hit by a photon with the specific wavelength to which that pigment is most sensitive). The three types of cones are L, M, and S, which have pigments that respond best to light of long (especially 560 nm), medium (530 nm), and short (420 nm) wavelengths respectively (Kandel et al., 2000). ...more on Wikipedia about "Trichromatic color vision"
The Two-Streams hypothesis is a widely accepted account of visual processing. As visual information exits the occipital lobe (also known as V1), it follows two main channels, or "streams." The ventral stream (also known as the "what pathway") travels to the temporal lobe and is involved with object identification. The dorsal stream (or, "where pathway") terminates in the parietal lobe and process spatial locations. ...more on Wikipedia about "Two Streams hypothesis"
The primate visual system consists of about thirty areas of the cerebral cortex called the visual cortex. The visual cortex is divided into the ventral stream and the dorsal stream. The ventral stream is associated with object recognition and form representation. It has strong connections to the medial temporal lobe (which stores long-term memories), the limbic system (which controls emotions), and the dorsal stream (which deals with object locations and motion). ...more on Wikipedia about "Ventral stream"
Visual phototransduction is a process by which light is converted into electrical signals in the rod cells and cone cells of the retina of the eye. It is divided into an activation process and an inactivation process. ...more on Wikipedia about "Visual phototransduction"
A visual routine is a means of extracting information from a visual scene. In his studies on human visual cognition, Shimon Ullman proposed that the human visual system's task of perceiving shape properties and spatial relations is split into two successive stages: an early " bottom-up" state during which base representations are generated from the visual input, and a later " top-down" stage during which high-level primitives dubbed "visual routines" extract the desired information from the base representations. In humans, the base representations generated during the bottom-up stage correspond to retinotopic maps (more than 15 of which exist in the cortex) for properties like color, edge orientation, speed of motion, and direction of motion. These base representations rely on fixed operations performed uniformly over the entire field of visual input, and do not make use of object-specific knowledge, task-specific knowledge, or other higher-level information. ...more on Wikipedia about "Visual routine"
The visual system is the part of the nervous system which allows organisms to see. ...more on Wikipedia about "Visual system"
This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia . Direct links to the original articles are in the text.
If you use exact copy or modified of this article you should preserve above paragraph and put also : It uses material from
the Shortopedia article about "Visual system".
| MAIN PAGE | MAIN INDEX | CONTACT US |