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The task of the visual system is to interpret what would otherwise be a two-dimensional image of the world as a moving, colored three-dimensional world.
This article mostly describes the visual system of mammals, although other higher animals have similar visual systems.
Light is inverted by the lens and projected onto the retina; blue-attuned cone cells will be most strongly stimulated by blue light, while yellow/red-attuned cone cells will not be. |
The eye is a complex biological mechanism, considered by some to be miraculous. The eye functions remarkably like a CCD camera, taking visible light and converting it into a stream of information that can be transmitted via nerves.
Light enters the eye, passing through the corneaThe cornea is the curved, transparent layer that covers the front part of the eye and protects its lower structures. Together with the lens, the cornea refracts light and consequently helps the eye to focus. The cornea gives a larger contribution to the t and the pupilThe term pupil can also mean student. pupil is the central transparent area (showing as black). The greenish-yellow area surrounding it is the iris. The white outer area is the sclera, the central transparent part of which is the cornea. In the eye, the p (controlled by the irisiris is the grey-brown area. The other structures visible are the transparent pupil (showing as black), the white outer sclera, of which the central part, the cornea, is transparent. In anatomy, the iris (correct classical plural, irides is the most visib) and is refracted by the lensLight from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. The lens or crystalline lens is a component of the eye. In concert with the cornea, it refracts li. The lens inverts the light and projects an image onto the retina.
The retina consists of a large number of "receptor" cells and contain a particular protein molecule called rhodopsinIn vertebrates, rhodopsin sometimes also known as visual purple is a photoreceptor protein. It is a pigment of the retina, which is responsible for the first events in the perception of light. A so-called 7TM G-protein coupled receptor, each scotopsin pro. When rhodopsin is struck by a photonFor the Japanese anime video, see Photon (anime). In physics, the photon (from Greek φοτος, meaning light is a quantum of excitation of the quantised electromagnetic field and is one of the elementary particles studied by qu (a particle of light) it transmits a signal to the cell; the more photons strike the cell, the stronger the signal will be. In some animals, like humans, cone cellCone cells or cones are cells in the retina which only function in relatively bright light. There are about 6 million in the human eye, concentrated at the fovea and gradually becoming sparser towards the outside of the retina. Cones are less sensitive ths contain rhodopsin molecules attuned to specific wavelengths of light; i.e., a blue cone cell contains rhodopsin most attuned to blue-wavelength light and will most strongly be stimulated by blue-wavelength light, while a yellow-red cone cell will only be weakly stimulated by blue-wavelength light. This gives the ability to distinguish color.