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<center>"Vision is the [http://mercy.urantia.org/cgi-bin/webglimpse/mfs/usr/local/www/data/papers?link=http://mercy.urantia.org/papers/paper48.html&file=/usr/local/www/data/papers/paper48.html&line=256#mfs art] of seeing the invisible." - Jonathan Swift</center>
==Visual system==
==Visual system==
The visual system in humans allows [[individual]]s to assimilate information from the environment. The act of seeing starts when the lens of the eye focuses an image of its surroundings onto a light-sensitive membrane in the back of the eye, called the [[retina]]. The retina is actually part of the [[brain]] that is isolated to serve as a transducer for the conversion of patterns of light into neuronal signals. The lens of the eye focuses light on the photoreceptive cells of the retina, which detect the [[photon]]s of light and respond by producing neural impulses. These signals are processed in a [[Hierarchy|hierarchical]] fashion by different parts of the brain, from the retina to the lateral geniculate nucleus, to the primary and secondary visual cortex of the [[brain]].
The visual system in humans allows [[individual]]s to assimilate information from the environment. The act of seeing starts when the lens of the eye focuses an image of its surroundings onto a light-sensitive membrane in the back of the eye, called the [[retina]]. The retina is actually part of the [[brain]] that is isolated to serve as a transducer for the conversion of patterns of light into neuronal signals. The lens of the eye focuses light on the photoreceptive cells of the retina, which detect the [[photon]]s of light and respond by producing neural impulses. These signals are processed in a [[Hierarchy|hierarchical]] fashion by different parts of the brain, from the retina to the lateral geniculate nucleus, to the primary and secondary visual cortex of the [[brain]].
