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=== | ||
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: The '''eye''' uses a [[lens]] to [[focus]] an [[image]] on the [[retina]]. | : The '''eye''' uses a [[lens]] to [[focus]] an [[image]] on the [[retina]]. | ||
: When the [[lens]] does not work well enough people can use glasses. | : 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 [[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 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" | {| class="wikitable" | ||
Revision as of 16:08, 24 June 2019
Contents
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 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 lenses.
|
| The lens refracts the rays of light to form an image of the object. |