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Eyes
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: '''Eyelashes''' are there to stop dust getting in our eyes.
: A person whose '''eyes''' don't see is called 'blind'.
: Your '''eyes''' can be damaged and make you blind if you stare at the [[sunThe Sun]].
===Examples===
==Key Stage 2==
===Meaning===
[[Eyes]] are the part of the body that allows us to [[sight|see]]. ===About Eyes===: Most animals have only two '''eyes''' but some have more and some have no '''eyes''' at all.: '''Eyes''' allow us to see colour.: '''Eyelids''' blink a couple of times every minute to keep our eyes moist.: '''Eyelashes''' are there to stop dust getting in our eyes.: A person whose '''eyes''' don't see is called 'blind'.: Your '''eyes''' can be damaged and make you blind if you stare at [[The Sun]].
==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 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'''. {| class="wikitable"|-|[[File:EyeDiagram.png|center|400px]]|-| style="height:20px; width:400px; text-align:center;" |A [[diagram]] of the '''eye'''.|} ===Focusing Images===: 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"|-|[[File:EyeImage.png|center|600px]]|-| style="height:20px; width:600px; text-align:center;" |The [[Lens (Eye)|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"|-|[[File:EyeDiagramKS4.png|center|400px]]|-| style="height:20px; width:400px; text-align:center;" |A [[diagram]] of the '''eye'''.|} ===Defects of 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"|-|[[File:EyeNearSighted.png|center|300px]]|[[File:EyeNearSightedCorrection.png|center|300px]]|-| style="height:20px; width:600px; text-align:center;" |The [[Lens (Eye)|lens]] in the '''eye''' of a person with [[myopia]] [[focus]]ses the [[light]] from distant objects in front of the [[retina]] creating a blurred [[image]].| style="height:20px; width:600px; text-align:center;" |A [[myopia|myopic]] person can place a [[Concave Lens|concave lens]] in front of the [[eye]] to correct their vision.|-|[[File:EyeLongSighted.png|center|300px]]|[[File:EyeLongSightedCorrection.png|center|300px]]|-| style="height:20px; width:600px; text-align:center;" |The [[Lens (Eye)|lens]] in the '''eye''' of a person with [[hyperopia]] [[focus]]ses the [[light]] in behind the [[retina]] creating a blurred [[image]].| style="height:20px; width:600px; text-align:center;" |A [[hyperopia|hyperopic]] person can place a [[Convex Lens|convex lens]] in front of the [[eye]] to correct their vision.|} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f287 ''Eye, page 182, GCSE Biology; Student Book, Collins, AQA '']:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Eye, pages 140-2, GCSE Biology, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f288 ''Eye; defects, page 186, GCSE Biology; Student Book, Collins, AQA '']:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Eyes, pages 1, GCSE Combined Science Trilogy 2, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Eyes, pages 154-157, GCSE Biology; Third Edition, Oxford University Press, AQA '']:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Eyes, pages 195, 196, 198, 199, GCSE Biology, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Eyes, pages 70, 71, GCSE Biology; The Revision Guide, CGP, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Eye, pages 44-45, GCSE Biology, Pearson, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Eyes, page 30, GCSE Biology; The Revision Guide, CGP, Edexcel '']:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Eyes, pages 78-80, GCSE Biology, CGP, Edexcel ''] ====OCR====:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Eye, pages 90, 92-93, 156, Gateway GCSE Biology, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Eyes, page 44, Gateway GCSE Biology; The Revision Guide, CGP, OCR ''] ==Beyond the Curriculum=={{#ev:youtube|https://www.youtube.com/watch?v=qrKZBh8BL_U}}