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Eyes

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[[File:Eye-diagram no circles border.svg.png|thumb|The human eye, via Wikipedia Commons]]The '''eyes''' are the visual organs of the body, and rest in two sockets halfway up the front of the [[skull]]. They are made up of several important parts:
 
[[File:Eye-diagram no circles border.svg.png|thumb|The human eye, via Wikipedia Commons]]The '''eyes''' are the visual organs of the body, and rest in two sockets halfway up the front of the [[skull]]. They are made up of several important parts:
   
*The [[cornea]], which is a clear lens covering the center of the eye. This focuses light on the back of the eyeball.
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*The cornea, which is a clear lens covering the center of the eye. This focuses light on the back of the eyeball.
 
*The iris, or colored part of the front of the eye, which is attached to muscles which can contract or expand the iris in response to light levels, giving rise to the center opening, the pupil.
 
*The iris, or colored part of the front of the eye, which is attached to muscles which can contract or expand the iris in response to light levels, giving rise to the center opening, the pupil.
 
*The sclera, the visible white part of the front of the eye, which forms the outer skin of the eyeball
 
*The sclera, the visible white part of the front of the eye, which forms the outer skin of the eyeball
 
*The vitreous humor, a thick transparent liquid which fills the eyeball and gives it its circular shape
 
*The vitreous humor, a thick transparent liquid which fills the eyeball and gives it its circular shape
*The [[retina]], which is a surface of light receptive cells at the back of the eyeball, containing rods, which are sensitive to light intensity, and cones, which are sensitive to color.
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*The retina, which is a surface of light receptive cells at the back of the eyeball, containing rods, which are sensitive to light intensity, and cones, which are sensitive to color.
*The [[optic nerve]], which penetrates the back of the eyeball through the blind spot, together with the blood vessels that provide blood to the eye, and transmits nerve impulses to the [[brain]].
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*The optic nerve, which penetrates the back of the eyeball through the blind spot, together with the blood vessels that provide blood to the eye, and transmits nerve impulses to the [[brain]].
   
 
In humans, the eye sacrifices some sensitivity to light, sensitivity to movement and the ability to see at distance for the ability to see in color. For example, cats, alhtough they have poor color vision, see much better in low light and can detect motion that is indetectable to a human.
 
In humans, the eye sacrifices some sensitivity to light, sensitivity to movement and the ability to see at distance for the ability to see in color. For example, cats, alhtough they have poor color vision, see much better in low light and can detect motion that is indetectable to a human.
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