Difference between revisions of "Eyes"
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===Meaning=== | ===Meaning=== | ||
[[File:EyeCrossSection.png|right|300px|thumb|A computer generated cross section of a human '''eye'''.]] | [[File:EyeCrossSection.png|right|300px|thumb|A computer generated cross section of a human '''eye'''.]] | ||
| − | The [[ | + | The [[eyes]] are a pair of sensory [[organ]]s which allow us to see. |
===About Human Eyes=== | ===About Human Eyes=== | ||
| Line 74: | Line 74: | ||
|[[File:EyeImage.png|center|600px]] | |[[File:EyeImage.png|center|600px]] | ||
|- | |- | ||
| − | | 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]]. | + | | 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== | ==Beyond the Curriculum== | ||
{{#ev:youtube|https://www.youtube.com/watch?v=qrKZBh8BL_U}} | {{#ev:youtube|https://www.youtube.com/watch?v=qrKZBh8BL_U}} | ||
Latest revision as of 07:52, 7 December 2019
Key Stage 1
Meaning
Eyes are the part of the body that allows us to 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.
Examples
 |
 |
| A cat eye. | The eye of a goat. |
 |
 |
| A chamelion's eye. | A crocodile eye. |
Key Stage 2
Meaning
Eyes are the part of the body that allows us to 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
The eyes are a pair of sensory organs 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 - 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.
 |
| 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.
 |
| The lens refracts the rays of light to form an image of the object. |
Key Stage 4
Meaning
The eyes are a pair of sensory organs containing 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 - 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 cells to detect light.
- Suspensory Ligaments - Tissue which connects the lens to the ciliary muscles.
- Ciliary Muscles - Muscles which can contract to squeeze the lens and relax to allow the lens to flatten. This is how the lens in the eye focusses light at different distances.
 |
| 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 lenses.
 |
 |
| The lens in the eye of a person with myopia focusses the light from distant objects in front of the retina creating a blurred image. | A myopic person can place a concave lens in front of the eye to correct their vision. |
 |
 |
| The lens in the eye of a person with hyperopia focusses the light in behind the retina creating a blurred image. | A hyperopic person can place a convex lens in front of the eye to correct their vision. |
References
AQA
- Eye, page 182, GCSE Biology; Student Book, Collins, AQA
- Eye, pages 140-2, GCSE Biology, Hodder, AQA
- Eye; defects, page 186, GCSE Biology; Student Book, Collins, AQA
- Eyes, pages 1, GCSE Combined Science Trilogy 2, Hodder, AQA
- Eyes, pages 154-157, GCSE Biology; Third Edition, Oxford University Press, AQA
- Eyes, pages 195, 196, 198, 199, GCSE Biology, CGP, AQA
- Eyes, pages 70, 71, GCSE Biology; The Revision Guide, CGP, AQA
Edexcel
- Eye, pages 44-45, GCSE Biology, Pearson, Edexcel
- Eyes, page 30, GCSE Biology; The Revision Guide, CGP, Edexcel
- Eyes, pages 78-80, GCSE Biology, CGP, Edexcel
OCR
- Eye, pages 90, 92-93, 156, Gateway GCSE Biology, Oxford, OCR
- Eyes, page 44, Gateway GCSE Biology; The Revision Guide, CGP, OCR