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Eyes
,→Key Stage 3
===Meaning===
[[File:EyeCrossSection.png|right|300px|thumb|A computer generated cross section of a human '''eye'''.]]
The [[Eyeseyes]] are a pair of sensory [[organ]]s which allow us to see.
===About Human Eyes===
: The '''eye''' uses a [[lens]] to [[focus]] an [[image]] on the [[retina]].
: When the [[lens]] does not work well enough people can use glasses.
{| class="wikitable"
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|[[File:EyeImage.png|center|600px]]
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| style="height:20px; width:600px; text-align:center;" |The lens [[Refraction|refracts]] the [[Light Ray|rays of light]] to form an [[image]] of the [[object]].
|}
==Key Stage 4==
===Meaning===
[[File:EyeCrossSection.png|right|300px|thumb|A computer generated cross section of a human '''eye'''.]]
The [[eyes]] are a pair of sensory [[organ]]s containing [[Receptor Cell|receptor cells]] which can detect [[light]].
===About Human Eyes===
: The eye is made of several parts:
*[[Retina]] - Detects light.
*[[Optic Nerve]] - Sends electrical signals from the eye to the brain.
*[[Lens (Eye)|Lens]] - Focuses the light onto the [[retina]].
*[[Iris]] - The coloured part of the eye.
*[[Pupil]] - The hole in the [[iris]] that allows light into the '''eye'''.
*[[Cornea]] - The outer protective layer of the '''eye'''.
*[[Sclera]] - A protective layer around the eye (the white area around the eye).
*[[Blind Spot]] - A point on the back of the '''eye''' without any [[Receptor Cell|receptor cells]] to detect [[light]].
*[[Suspensory Ligament]]s - [[Tissue]] which connects the [[Lens (Eye)|lens]] to the [[Ciliary Muscle|ciliary muscles]].
*[[Ciliary Muscle]]s - [[Muscle]]s which can contract to squeeze the [[Lens (Eye)|lens]] and relax to allow the [[Lens (Eye)|lens]] to flatten. This is how the [[Lens (Eye)|lens]] in the [[eye]] [[focus]]ses [[light]] at different distances.
{| class="wikitable"
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|[[File:EyeDiagramKS4.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |A [[diagram]] of the '''eye'''.
|}
===Defects in the Eye===
: The '''eye''' uses a [[lens]] to [[focus]] an [[image]] on the [[retina]].
: When the [[lens]] does not work well enough people require corrective [[lens]]es.
{| class="wikitable"