Difference between revisions of "Eyes"
(→Key Stage 3) |
(→Defects in the Eye) |
||
| Line 109: | Line 109: | ||
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
| − | |[[File: | + | |[[File:EyeFarSighted.png|center|300px]] |
| + | |[[File:EyeFarSightedCorrection.png|center|300px]] | ||
|- | |- | ||
| − | | style="height:20px; width:600px; text-align:center;" |The lens [[ | + | | style="height:20px; width:600px; text-align:center;" |The [[Lens (Eye)|lens]] in the '''eye''' of a far sighted person [[focus]]ses the [[light]] in front of the [[retina]] creating a blurred [[image]]. |
| + | | style="height:20px; width:600px; text-align:center;" |A far sighted person can place a [[Concave Lens|concave lens]] in front of the [[eye]] to correct their [[vision]]. | ||
| + | |- | ||
| + | |[[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 near sighted person [[focus]]ses the [[light]] in behind the [[retina]] creating a blurred [[image]]. | ||
| + | | style="height:20px; width:600px; text-align:center;" |A near sighted person can place a [[Convex Lens|convex lens]] in front of the [[eye]] to correct their [[vision]]. | ||
|} | |} | ||
==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}} | ||
Revision as of 16:54, 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 in the eye of a far sighted person focusses the light in front of the retina creating a blurred image. | A far sighted person can place a concave lens in front of the eye to correct their vision. |
 |
 |
| The lens in the eye of a near sighted person focusses the light in behind the retina creating a blurred image. | A near sighted person can place a convex lens in front of the eye to correct their vision. |
